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Description  |
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BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a photographic camera system, and more
particularly to a photographic camera system for enabling pseudo telephoto
and pseudo panoramic prints to be obtained from normal exposures by coding
an exposure to identify a selected type print.
2. Description of the Prior Art
Conventionally, for example, Japanese Patent Laid-Open Publication No.
26721/1979, U.S. Pat. No. 4,583,831 and U.S. Pat. No. 3,490,844 have
proposed a photographic camera system constituted by a camera which is
provided with an operating member capable of designating, in each frame of
a film, a printing zone to be printed, at the time of photographing an
object, in the vicinity of the image plane of the film a data indicative
of the printing zone and a printer which reads the data for each frame
from the film photographed by the camera so as to print the designated
printing zone on the basis of the data. In photographic camera systems of
the above described type, in the case where the printing zone is so
designated at the time of photographing an object as to be narrower than
an ordinary printing zone and a print is made by enlarging size of the
print to that of an ordinary print at the time of printing the film, the
zone narrower than that of the ordinary print is enlarged in the print and
thus, the print is equivalent to a print photographed by an objective lens
having a focal length longer than that of the objective lens of the
camera. Therefore, an effect substantially equivalent to an effect gained
upon change of the focal length of the objective lens can be
advantageously achieved.
Meanwhile, recently, cameras provided with a data imprinting device for
imprinting at an end portion in the frame, data such as dates of
photographing objects are widely commercially available. Then, if the data
imprinting device is provided in the cameras of the above described type,
such a phenomenon may undesirably take place that in the case where a
printing zone narrower than an ordinary printing zone has been designated
at the time of photographing objects, data imprinted on the film are not
printed on the printing paper.
The above described photographic camera systems have such a drawback that
since the operating member for designating the printing zone and an
imprinting means for imprinting, in accordance with operational states of
the operating member, on the film, data indicative of the printing zone
are required to be provided in the camera body, production cost of the
camera body is increased.
Furthermore, in the cameras for use in the above described photographic
camera systems, when a light measuring angle of an optical system of a
light measuring device for measuring, for exposure control, brightness of
the object is set at an angle of view corresponding to the ordinary
printing zone, such a phenomenon may occur that in the case where the
printing zone narrower than the ordinary printing zone is designated, even
a zone which is not reproduced in the print is subjected to light
measurement for exposure control, thereby resulting in improper exposure
of the film. On the contrary, when the light measuring angle is set an
angle of view corresponding to the designated printing zone narrower than
the ordinary printing zone, spot light measurement and average light
measurement are performed in the case where the ordinary printing zone and
the printing zone narrower than the ordinary printing zone are designated,
respectively. Hence, light measuring methods vary according to area of the
designated printing zone. For example, if an object of extremely high
brightness exists between an angle of view corresponding to a case in
which the ordinary printing zone is designated (referred to as a "real
focal length photographing mode") and an angle of view corresponding to a
case in which the printing zone narrower than the ordinary printing zone
is designated (referred to as a "pseudo focal length photographing mode"),
exposure control is performed, in the case where the light measuring angle
of average light measurement is set at the angle of view corresponding to
the real focal length photographing mode, on the basis of light
measurement of even the object of high brightness which is not printed in
the pseudo focal length photographing mode. As a result, the film is
underexposed in the pseudo focal length photographing mode. On the other
hand, in the case where the light measuring angle of average light
measurement is set at an angle of view corresponding to the pseudo focal
length photographing mode, the object of high brightness is printed but is
not subjected to light measurement in the real focal length photographing
mode, thereby resulting in overexposure of the film in the real focal
length photographing mode.
Moreover, in the cameras for use in the above described photographic camera
systems, it is so arranged that not only the operating member is displaced
but size of the frame of field of view in the viewfinder varies upon
operation of the operating member such that the printing portion can be
confirmed through the viewfinder. However, in such arrangement, it is
impossible to determine from external appearance of the camera whether the
camera is set to the real focal length photographing mode or the pseudo
focal length photographing mode. Thus, there is such a possibility that a
user of the camera is incapable of determining from external appearance of
the camera whether the camera is set to the real focal length
photographing mode or the pseudo focal length photographing mode with the
result that the user photographs an object in one mode other than that
expected by the user.
Meanwhile, in the cameras for use in the photographic camera systems, in
the case where the pseudo focal length photographing mode for printing the
narrower zone has been selected, incoming light is incident upon even a
zone other than the printing zone. Such incoming light is essentially
unnecessary and rather, may deteriorate image quality due to its
reflection in the light shielding barrel or lens barrel.
SUMMARY OF THE INVENTION
Accordingly, an essential object of the present invention is to provide a
camera which is capable of recording data such as date in a printing zone
in both a real focal length photographing mode and a pseudo focal length
photographing mode.
Another object of the present invention is to provide a camera accessory
which enables changeover of a camera between the real focal length
photographing mode and the pseudo focal length photographing mode without
incurring rise of production cost of the camera body.
Still another object of the present invention is to provide a camera in
which proper exposure is performed at all times in both the real focal
length photographing mode and the pseudo focal length photographing mode.
A further object of the present invention is to provide a camera in which
whether the camera is set to the real focal length photographing mode or
the pseudo focal length photographing mode can be determined easily.
A still further object of the present invention is to provide a camera
which is capable of preventing deterioration of image quality due to light
incident upon a zone outside a zone to be printed in the pseudo focal
length photographing mode.
In order to accomplish these objects of the present invention, a
photographic camera system according to one preferred embodiment of the
present invention comprises: a mode setting means for selectively setting
said photographic camera system to a real focal length photographing mode
for printing an ordinary photographic zone and a pseudo focal length
photographing mode for printing a zone narrower than the ordinary
photographic zone; a recording means for recording on a film information
corresponding to a set one of the real focal length photographing mode and
the pseudo focal length photographing mode; a data imprinting means for
selectively imprinting data such as date at one of a plurality of
different positions on a photographing portion of the film; and a selector
means for selecting said one of a plurality of the different positions in
accordance with the set one of the real focal length photographing mode
and the pseudo focal length photographing mode.
BRIEF DESCRIPTION OF THE DRAWINGS
These objects and features of the present invention will become apparent
from the following description taken in conjunction with the preferred
embodiments thereof with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a camera provided with a data imprinting
device, according to a first embodiment of the present invention;
FIG. 2 is a top plan view of the camera of FIG. 1;
FIG. 3 is a side elevational view of the camera of FIG. 1;
FIGS. 4 and 5 are views indicative of a light measuring optical system
employed in the camera of FIG. 1 in a real focal length photographing mode
and a pseudo focal length photographing mode, respectively;
FIG. 6 is a front elevational view of an inside of a back cover employed in
the camera of FIG. 1;
FIG. 7 is a front elevational view of an outside of the back cover of FIG.
6;
FIG. 8 is a rear elevational view of an inside of the camera of FIG. 1;
FIG. 9 is a front elevational view of a liquid crystal display portion of
the camera of FIG. 1;
FIG. 10 is a front elevational view of a film photographed by the, camera
of FIG. 1;
FIG. 11 is an electrical circuit diagram of the camera of FIG. 1;
FIGS. 12A to 12E are flow charts showing a processing sequence of signals
of exposure control and photographing in the camera of FIG. 1;
FIG. 13 is a flow chart showing a processing sequence of film rewinding
operation in the camera of FIG. 1;
FIG. 14 is a flow chart showing a processing sequence of flash photography
display in the camera of FIG. 1;
FIGS. 15A to 15C are flow charts showing a processing sequence of display
in the camera of FIG. 1;
FIGS. 16A and 16B are flow charts showing a processing sequence of signals
of the back cover of FIG. 6;
FIG. 17 is a flow chart showing a processing sequence of interruption in
the camera of FIG. 1;
FIG. 18 is a flow chart showing a processing sequence of imprinting of the
number of prints in the camera of FIG. 1;
FIG. 19 is a time chart explanatory of time possible to imprint the number
of prints in the camera of FIG. 1;
FIG. 20 is a schematic view of a film printer for the camera of the present
invention;
FIG. 21 is a schematic view of a control unit of the film printer of FIG.
20;
FIGS. 22A and 22B are flow charts showing a processing sequence of control
in the printer of FIG. 20;
FIG. 23 is a perspective view of a camera according to a second embodiment
of the present invention;
FIG. 24 is a front elevational view of the camera of FIG. 23 in the real
focal length photographing mode;
FIG. 25 is a top plan view of the camera of FIG. 24;
FIG. 26 is a perspective view of the camera of FIG. 23 in the pseudo focal
length photographing mode;
FIGS. 27A to 27C are views showing transitional states of a front face and
a side face of a lens barrel of the camera of FIG. 23 during its
changeover from the real focal length photographing mode to the pseudo
focal length photographing mode, respectively;
FIG. 28 is a longitudinal sectional view of the lens barrel of FIG. 27; and
FIG. 29 is a view similar to FIG. 28, particularly showing a third
embodiment of the present invention.
Before the description of the present invention proceeds, it is to be noted
that like parts are designated by like reference numerals throughout
several views of the accompanying drawings.
DETAILED DESCRIPTION OF THE INVENTION
Initially, construction of a camera K1 according to a first embodiment of
the present invention will be described with reference to FIGS. 1 to 10,
hereinbelow. As shown in FIGS. 1 to 3, the camera K1 includes a camera
body 1, an objective lens 2, a shutter release button 3, a trimming lever
4, a liquid crystal display panel 5, a flash light emitting panel 6, a
viewfinder window 7, distance measuring windows 8 and 9 and a light
receiving window 10 of an automatic exposure control means (referred to as
an "AE", hereinbelow).
FIG. 2 shows changeover of the camera K1 between wide angle (standard)
photography (indicated by a mark "Wide" in FIG. 1) and telephotography
(indicated by a mark "Tele" in FIG. 1) through trimming upon operation of
the trimming lever 4. When the trimming lever 4 is displaced towards the
mark "Wide", i.e. rightwards in FIG. 2, a cam plate 4a is also displaced
rightwards in FIG. 2, so that a retainer plate 10 for a changeover optical
system is displaced upwardly in FIG. 2 through a pin 10a engaged with a
groove 9b of the cam plate 4a and thus, the camera K1 is changed over to
the wide angle (standard) position shown by the broken lines in FIG. 2. In
FIG. 2, reference numerals 14a and 14b denote projection lenses for an
automatic focus detecting means (referred to as an "AF", hereinbelow) and
reference numerals 15a and 15b denote light receiving lenses for the AE
and reference numerals 16a and 16b denote light receiving lenses for the
AF. The projection lens 14a, the light receiving lenses 15a and 16a are
fixed in position, while the projection lens 14b and the light receiving
lenses 15b and 16b are displaced forwardly and rearwardly in the camera K1
by the retainer plate 10. In the above described arrangement of the camera
K1, when the trimming lever 4 is changed over to the mark "Tele", a range
illuminated by incident light for the AF is decreased and a combined focal
length of the light receiving lenses 16a and 16b for the AF is increased
such that accuracy of distance measurement is raised. At the same time, a
combined focal length of the light receiving lenses 15a and 15b for the AE
is also increased such that a light measuring range is decreased in
conformity with a trimming zone. When the trimming lever 4 is changed over
to the mark "Tele", a viewfinder lens 20 is displaced downwardly in FIG. 2
and a viewfinder lens 21 is displaced upwardly in FIG. 2, so that a
magnification of the viewfinder is increased and a zone to be printed upon
the pseudo focal length photographing mode is indicated by a viewfinder
frame.
Meanwhile, reference numeral 22 denotes a frame reflecting mirror lens,
reference numeral 23 denotes an eyepiece, reference numeral 17 denotes a
photo detector for the AE, reference numeral 18 denotes a light emitting
element for the AF and reference numeral 19 denotes a photo detector for
the AF. The flash light emitting device is constituted by a reflecting
bevel 11, a xenon light emitting tube 12 and a movable panel 13 and
functions as a zoom strobe whose angle of illumination changes upon
operation of the trimming lever 4.
Referring to FIGS. 4 and 5, there is shown a light measuring optical system
employed in the camera K1. The light measuring optical system includes a
light measuring photo detector 17, a lens 15a fixed to the camera body, an
aperture S disposed forwardly of the lens 15a and a lens 15b. The light
measuring photo detector 17 is formed by a silicon photo diode and its
package has a side face r acting as a lens face having a positive
refracting power. FIG. 4 shows positions of the lenses 15a and 15b in a
real focal length photographing mode for designating an ordinary printing
zone, while FIG. 5 shows positions of the lenses 15a and 15b in a pseudo
focal length photographing mode for designating a printing zone narrower
than the ordinary printing zone, respectively. As will been seen from
FIGS. 4 and 5, upon changeover of the camera K1 from the real focal length
photographing mode to the pseudo focal length photographing mode, only the
lens 15b is displaced forwardly in the direction of the optical axis of
the camera K1 such that a distance between the lenses 15a and 15b is
increased. Therefore, assuming that a light measuring angle in the real
focal length photographing mode of FIG. 4 is represented by .theta.a and a
light measuring angle in the pseudo focal length photographing mode of
FIG. 5 is represented by .theta.b, .theta.a>.theta.b.
More specifically, initially supposing that reference character ft denotes
a combined focal length of the light measuring optical system by
neglecting the refracting power of the lens face r of the package of the
light measuring photo detector 17 and reference characters f1 and f2
denote focal lengths of the lenses 15a and 15b, respectively, the combined
focal length ft is given by the following equation (1):
1/ft=(1/f1)+(1/f2)-(e/f1f2) (1)
where reference character e denotes a distance between the lenses 15a and
15b. As will be understood from the equation (1), value of the right side
of the equation (1) decreases when the distance e is increased on the
assumption that both of the focal lengths f1 and f2 are positive. Hence,
the combined focal length ft of the light measuring optical system
increases. When the combined focal length ft of the light measuring
optical system is increased, a light measuring angle of the light
measuring optical system decreases and thus, it becomes possible to
decrease the light measuring angle of the light measuring optical system
by increasing the distance e between the lenses 15a and 15b. To this end,
in the camera K1, the lens 15b disposed more adjacent to an object to be
photographed than the lens 15a is displaced in the direction of the
optical axis so as to change the distance e between the lenses 15a and 15b
such that the light measuring angle of the light measuring optical system
is changed. Namely, in the camera K1, the distance between the lenses 15a
and 15b is decreased in the real focal length photographing mode as shown
in FIG. 4 such that the light measuring angle of the light measuring
optical system is set at the relatively wide angle .theta.a, while the
distance between the lenses 15a and 15b is increased in the pseudo focal
length photographing mode as shown in FIG. 5 such that the light measuring
angle of the light measuring optical system is set at the narrow angle
.theta.b corresponding to the narrow printing zone printed in the pseudo
focal length photographing mode. The light measuring photo detector 17 is
arranged to perform average light measurement of light incident from
within the light measuring angle.
Meanwhile, FIG. 6 shows an inside of a back cover 43 of the camera K1. The
back cover 43 includes terminals 37 for receiving signals from the camera
body, a print number imprinting portion 36 for imprinting the number of
prints on the film, a trimming data imprinting portion 38 for imprinting
trimming data on the film and data imprinting portions 39 and 40 for
imprinting on the film data such as dates. The terminals 37 include four
terminals IP (imprint), TRD (trimming data), DIS (disable) and GND
(ground) disposed at positions confronting terminals provided at the
camera body. The print number imprinting portion 36 is provided so as to
imprint, as a four-bit signal, a preset number of prints on the film upon
depression of a push-button switch 44 to be described later and are
constituted by four light emitting diodes. The trimming data imprinting
portion 38 is constituted by a single light emitting diode and is arranged
to imprint a trimming mark 38a on the film in response to a trimming
signal produced at the time when the trimming lever 4 is set to the mark
"Tele". The data imprinting portion 39 is provided for imprinting data on
the film when the trimming lever 4 is set to the mark "Wide", i.e. when
the real focal length photographing mode is set. On the other hand, the
data imprinting portion 40 is provided for imprinting data on the film
when the trimming lever 4 is set to the mark "Tele", i.e. when the pseudo
focal length photographing mode is set. In consideration of the fact that
data of the data imprinting portion 40 are enlarged at a large
magnification, size of the data of the data imprinting portion 40 is made
smaller than that of the data imprinting portion 39.
FIG. 7 shows an outside of the back cover 43. The back cover 43 includes
the push-button switch 44 for imprinting the number of prints on the film,
a push-button switch 45 for setting the number of prints and a display
portion 47 for displaying the number of prints. By depressing the
push-button switch 45 prior to photographing an object, prints to be made
are set at a required number. Each time the push-button switch 45 is
depressed once, numerals ranging from 0 to 8 are sequentially set in an
increasing order so as to be displayed by the display portion 47. The
numeral 0 appears again subsequently to the numeral 8. Then, by depressing
the push-button switch 44, the set number of the prints is imprinted on
the film as the four-bit signal. A mark 49 for indicating that the number
of the prints has been imprinted on the film is provided at a portion of
the display portion 47 and is displayed upon depression of the push-button
switch 44. When a date imprinting mode switch 50 is turned on, dates are
allowed to be imprinted on the film. Meanwhile, when the date imprinting
mode switch 50 is turned off, dates are not allowed to be imprinted on the
film. Reference numeral 46 denotes a date display portion for indicating a
date to be imprinted.
FIG. 8 shows an inside of the camera K1 as viewed from the back cover 43 by
opening the back cover 43. In FIG. 8, reference numeral 29 denotes a
position of the back cover 43. A trimming signal brush 24 and a trimming
signal substrate 25, which are provided inside the trimming lever 4,
constitute a slide switch. This slide switch is turned on when the
trimming lever 4 is set to the mark "Tele" so as to transmit to a
processor a signal indicative of whether the trimming lever 4 is set to
the mark "Wide" or the mark "Tele". Reference numeral 26 denotes a
photographing frame of an ordinary size of 24.times.36 mm provided in the
camera body. In order to enable the user to confirm the printing zone on a
negative film after photographing when an object is photographed by
setting the trimming lever 4 to the mark "Tele", around the photographing
frame 26, four recesses A are formed such that two of the recesses A is
disposed at a right side of the photographing frame 26, with the remaining
two of the recesses A being disposed on a bottom side of the frame 26. A
zone designated by reference numeral 35 represents a printing zone when
the pseudo focal length photographing mode is set. A terminal 28 is
provided for delivering signals from the camera body to the back cover 43
and is constituted by four terminals IP (imprint), TRD (trimming data),
DIS (disable) and GND (ground). Meanwhile, reference numeral 30 denotes a
film pressing plate, reference numeral 31 denotes a flash switch lever,
reference numeral 32 denotes a film cartridge and reference numeral 33
denotes a film take-up spool.
FIG. 9 shows the liquid crystal display panel 5 provided on the upper face
of the camera body. Firstly, on the liquid crystal display panel 5, the
number CAM of photographable frames of the film is displayed by reading a
CAS code on a DX film cartridge. When the CAS code is not present, display
of the number CAM of photographable frames of the film is cancelled.
Secondly, on the liquid crystal display panel 5, a film speed ISO
indicative of a film speed based on ISO (International Organization for
Standardization) is displayed by reading the CAS code on the DX film
cartridge. In the case where the CAS code is not provided on the film
cartridge, "ISO 100" is displayed. Thirdly, an indication that the film
cartridge is loaded into the camera body is displayed. When the film
cartridge is loaded into the camera body and then, the back cover 43 is
closed, a mark "PAM" is displayed. Fourthly, displays of states of the
film in the camera body include a display FSM that the film is being
preliminarily fed, a display WM that the film is being wound and a display
RWM that the film is being rewound are displayed. Fifthly, a natural light
photographing mode AM and a flashlight photographing mode FM are
displayed. Sixthly, the number FCD of the photographed frames of the film
is displayed. Seventhly, when the film is underexposed due to dark field
to be photographed, a warning LLM on a low shutter speed limit for
underexposure and an indication CHM of completion of electric charging of
the flash are displayed by blinks of light emitting diodes. These
indications are displayed on the basis of signals processed in a
microprocessor to be described later with the exception that the
indication CHM of completion of electric charging of the flash is
displayed on the basis of signals in a flash circuit. FIG. 10 shows a film
photographed by the camera K1. In FIG. 10, reference numeral 35 denotes a
zone of an image plane to be printed when the pseudo focal length
photographing mode is set. The trimming mark 38a is imprinted on the film
by the trimming data imprinting portion 38 as described earlier with
reference to FIG. 6. A print number code 36a indicative of the number of
prints to be made is imprinted on the film by the print number imprinting
portion 36. Data 39a such as dates are imprinted on the film by the data
imprinting portion 39 when the real focal length photographing mode is
set. Meanwhile, data 40a such as dates are imprinted on the film by the
data imprinting portion 40 when the pseudo focal length photographing mode
is set.
Then, an electric circuit of the camera K1 will be described with reference
to FIG. 11. As indicated at the bottom portion of FIG. 11, the left and
right side portions of FIG. 11 are, respectively, incorporated into the
camera body and the back cover 43. Initially, a circuit portion in the
camera body is described. Electric power supplied from a battery BA1 is
applied to a first processor CPU1 and other components through a voltage
stabilizing circuit constituted by a diode D1 and a capacitor C1 and is
fed to the automatic exposure control circuit AE, the automatic focus
detecting circuit AF, a digital-analog converter DA, a flash timer FT by
way of a power source transistor BT actuated by signals from the first
processor CPR1. Switches for transmitting operational states of the camera
K1 to the first processor CPU1 include a light measuring switch S1 to be
closed upon depression of the shutter release button 3 to the first stage,
a release switch S2 to be closed upon depression of the shutter release
button 3 to the second stage, a winding switch WS to be closed in response
to detection of winding of one frame of the film, a detection switch FIS
for detecting loading of the film into the camera body, a trimming switch
TRS to be closed at the time when the trimming lever 4 is set to the mark
"Tele", namely at the time when the pseudo focal length photographing mode
is set, a switch FLS to be closed at the time of use of the flash device,
a detection switch BCS for detecting opening and closing of the back cover
43, a switch CAF for reading from the CAS code on the film cartridge a
code of the number of photographable frames of the film and a switch CAI
for reading a film speed code from the CAS code. The detection switch FIS
is closed when the film is not loaded into the camera body. Meanwhile, the
detection switch BCS is turned on and off when the back cover 43 is closed
and opened, respectively.
Output ports of these switches are connected to an interruption terminal
ITO and input ports P0, P1, P2, P3, P40, P4, P5, P6 and P19, respectively.
Meanwhile, when the switch FLS and the detection switch BCS are turned off
from the on state and are turned on from the off state, the switch FLS and
the detection switch BCS deliver positive edge signals to input ports IT1
and IT2 through pulse generators PG2 and PG1 for interrupting the first
processor CPU1, respectively so as to reset data given to the first
processor CPU1. A film winding signal and a film rewinding signal are
transmitted from output ports P7 and P8 of the first processor CPU1 so as
to control a driving motor MO. When a start signal is transmitted from an
output port P9 of the first processor CPU1 to a flash circuit FL, boosting
and electric charging of the flash circuit FL are started. Upon completion
of electric charging of the flash circuit FL, a signal CH is issued to an
input port P10 of the first processor CPU1. The flash circuit FL is turned
on in response to a flash start signal FSTA from the flash timer FT. A
release control circuit RL is actuated by a positive edge signal from an
output port P11 of the first processor CPU1 so as to release the shutter
such that the automatic focus detecting circuit AF is released from
locking. A signal for actuating the power source transistor BT is supplied
from an output port P12 of the first processor CPU1.
In an exposure control circuit AE, when the power source is turned on,
light measurement of field to be photographed is performed. When a signal
MM for commanding storage of a light measurement value is delivered from
an output port P13 of the first processor CPU1, an exposure value EV1 is
fixed (hereinbelow, referred to as "AE lock"). The exposure value EV1 is
determined in accordance with a light measurement value and the film speed
obtained by converting the data of switch CAI to an analog signal by the
digital-analog converter DA through a signal line ISA. Upon completion of
focus detection by an automatic focus detecting circuit AF and completion
of focus adjustment by the automatic focus detecting mechanism, the
shutter is released so as to start opening. At this moment, a count switch
for actuating a counter for counting pulses outputted from an encoder in
response to displacement of the shutter is turned on. A count value EV2 of
the counter, which represents amount of exposure after start of opening of
the shutter, and the exposure value EV1 subjected to AE lock are compared
with each other. When the count value EV2 and the exposure value EV1
coincide with each other, a shutter control magnet EM is turned off so as
to close the shutter and, at the same time, a shutter closing signal ECE
is transmitted to a port P15 of the first processor CPU1 and the flash
timer FT. When the exposure value EV1 subjected to AE lock is smaller than
a predetermined value, the film is underexposed and thus, a low-speed
limit warning signal LL is delivered to a port P14 of the first processor
CPU1. In this case, when the count value EV2 has reached a predetermined
value, the shutter is forcibly closed even if the count value EV2 has not
yet reached the exposure value EV1 subjected to AE lock.
In the automatic focus detecting circuit AF, when the power source is
turned on, distance measurement is started. Thus, the automatic focus
detecting circuit AF stores the distance measurement data and, at the same
time, output the distance measurement data to the flash timer FT. When the
automatic focus detecting mechanism is released from locking upon
actuation of the release circuit RL, displacement of the lens is started
and a travel distance of the lens is measured by using pulses. When the
lens is displaced to an in-focus position upon coincidence of the travel
distance of the lens measured by using pulses with the distance
measurement data stored beforehand, a driving magnet AM is de-energized so
as to prevent displacement of the lens such that the lens is stopped.
Meanwhile, a signal indicative of real focal length photographing mode or
pseudo focal length photographing mode is directly transmitted from the
trimming switch TR to the automatic focus detecting circuit AF such that
distance measurement calculation for decoding a measured value into a
distance zone, which is performed in the automatic | | |
