JPH06313913A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera having a shutter measuring instrument performing only the inspection of a shutter independently of photographing. CONSTITUTION:This camera is provided with a shutter means 8 restricting exposing time for a recording medium, a measuring means for measuring time when the shutter means 8 performs the exposure for the recording medium in accordance with the actuation of the shutter means 8, a driving mechanism for driving a mechanism other than the shutter means 8 and the measuring means, and a switching means for switching an ordinary mode in which photographing operation is performed by driving the shutter means 8 and the driving mechanism and an inspection mode in which the shutter means 8 and the measuring means are driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera in which a shutter means measures the time for exposing a recording medium.

[0002]

2. Description of the Related Art Conventionally, in a camera, a light flux from a subject is limited by a diaphragm of a lens and an exposure time of a film is limited by a mechanical shutter. The shutter used in a single-lens reflex camera basically consists of two curtains, a front curtain and a rear curtain, and the front curtain covers the film screen before exposure.

When the shutter button is pressed, the front curtain first retracts from the screen and exposure of the film screen is started. After a lapse of a predetermined time, the rear curtain operates so as to cover the film screen. The traveling of the front curtain and the rear curtain is performed by a mechanically biased spring force, and the traveling is started by releasing the locking of the front curtain and the rear curtain.

In the past, these operations were controlled purely mechanically, but in recent years electrical control has come to be used more often. That is, the spring force is still used as the driving force for the running of the front curtain and the rear curtain, but the start of the travel is controlled by energizing the electromagnets that lock the front curtain or the rear curtain to release the lock. It has been done.

On the other hand, speeding up the shutter such as 1/8000 seconds is becoming an important specification, and the stroboscope has been used more and more in recent years, and it is necessary to speed up the strobe synchronization speed so that the image can be drawn in a bright environment. Has become.

For this purpose, the above-mentioned spring force must be increased to dramatically increase the traveling speeds of the front and rear curtains (hereinafter referred to as the curtain speeds), and the front and rear curtains can be driven. The slit width to be formed must be controlled so as to be narrow. Therefore, at a high speed of over 1/8000 second, even if the energization timing of the electromagnet is accurately controlled, the disengagement speed of the locking mechanism with respect to the electromagnet, the variation of the machine traveling system including the spring, etc. Therefore, the desired shutter speed may not be obtained. Furthermore, the fact that the desired shutter speed was not obtained could not be found without developing the film, but the time taken for the shutter means to expose the recording medium was measured so that it could be found during or immediately after shooting. A camera designed to do so has been proposed.

[0007]

The shutter speed accuracy is most often a problem at the maximum speed, but especially at high speeds exceeding 1/8000 seconds, it is used in normal photography. However, there is a problem in that it is difficult to obtain the time data even when the shutter time correction is performed not only by the shutter time inspection but also by the temperature change.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a camera having a shutter measuring device capable of performing only a shutter inspection independently of photographing.

[0009]

In order to achieve this object, a first aspect of the present invention relates to a shutter means for limiting an exposure time of a recording medium, and the shutter means changes the recording medium to a recording medium according to the operation of the shutter means. Measuring means for measuring the exposure time, a driving mechanism for driving the shutter means and a mechanism other than the measuring means, a normal mode for driving the shutter means and the driving mechanism to perform a photographing operation, a shutter means and a measuring means. A switching means for switching between the inspection mode to be driven and the inspection mode is provided, and the driving mechanism is not driven in the inspection mode.

According to a second aspect of the present invention, there is provided shutter means for limiting the exposure time of the recording medium, and operation of the shutter means.
Measuring means for measuring the time for which the shutter means exposes the recording medium, a drive mechanism for driving the shutter means and a mechanism other than the measuring means, a normal mode for driving the shutter means and the drive mechanism to perform a photographing operation, It is configured to have a switching means for switching between the shutter means and the inspection mode for driving the measuring means.

According to a third aspect of the present invention, there is provided shutter means for limiting the exposure time of the photographic film, measuring means for measuring the time for the shutter means to expose the photographic film according to the operation of the shutter means, and the photographic film. It has a hoisting means for hoisting, a switching means capable of switching between a normal mode in which the hoisting means is activated when the operation of the shutter means is completed, and an inspection mode in which the operation of the hoisting means is prohibited.

[0012]

In the camera having the above structure, the normal mode and the inspection mode are switched regardless of the driving of the driving mechanism, so that only the shutter inspection can be performed independently of the photographing.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a camera according to the present invention.

FIG. 1 shows a state in which the back cover 4 is opened. A film cartridge (not shown) is loaded in the cartridge chamber 5, and the film pulled out from the cartridge passes through the front surface of the aperture 6 and is spooled on the spool 7. Wrapped around. The pressure plate 9 provided inside the back cover 4 has a function of pressing a film (not shown) against the aperture 6 to maintain the flatness. Reference numeral 29 is a film detection switch for detecting whether or not a film is loaded in the camera 1. The shutter 8 provided inside the aperture 6 covers a slightly wider area than the aperture 6 shown by the wavy line in the figure, and guides the subject light that has passed through the lens 2 onto the film screen for a predetermined time.

The photographer visually recognizes the condition of the object passing through the lens 2 from the viewfinder 3 and presses the release button 10 to instruct the start of exposure. The exposure mode and various conditions can be confirmed on the display unit 12. An LCD (Liquid Cristal Display) 34 described later is built in the display means 12.

The plurality of setting buttons 11 are operation buttons for arbitrarily setting the operation mode and various conditions of the camera 1, and are used to operate while confirming characters on the display means 12. In addition, the shutter 8 of the camera 1,
The film feeding mechanism, the mirror mechanism, the diaphragm control mechanism, etc. (none of which are shown) are configured to be able to operate independently.

2A and 2B are sectional views taken along the line AA of FIG. 1 and are sectional views for explaining the film detection switch 29 in more detail.

As shown in FIG. 2A, when the film is not loaded in the camera 1, the contact piece 29a is opened. As shown in FIG. 2B, when the film is loaded in the camera 1, the film detection switch 29 is pressed by the film winding tension, and the contact pieces 29a and 29b are brought into conduction, so that the state changes. Detect the presence or absence of film.

FIG. 3 is a block connection diagram showing an embodiment of a camera according to the present invention.

This circuit uses the battery 25 as a power source, and the central control is executed by the CPU 32. Input signals to the CPU 32 are as follows.

The photometric means 26 is a sensor means for measuring the brightness of each part of the subject divided into a plurality of parts, and supplies a plurality of photometric values to the CPU 32. The film sensitivity detecting means 27 reads the code signal given to the side surface of the loaded film cartridge, and the film sensitivity information is CP.
Supply to U32. The switch detection means 28 is a manual operation switch including the switches interlocked with the release button 10 and the setting button 11 and the film detection switch 29, and includes a timing switch for detecting the sequence state of the camera. Switch detection means 28
Supplies the camera status information to the CPU 32.

The CPU 32 performs the following drive control via the driver means 33.

The LCD 34 is driven to display information regarding exposure and operation mode setting, a warning display, and the like.
The shutter 8, more specifically, controls the interval of the operating time of the front curtain magnet and the rear curtain magnet, that is, the exposure time. The diaphragm 35 in the lens 2 is driven to control the amount of passing light.

Further, the CPU 32 drives the motor 36, more specifically, the shutter motor 36a, the film motor 36b, and the mirror diaphragm motor 36c, to urge the shutter drive spring, wind the film, and rewind the film. , Drive control of mirror and diaphragm charge.

Further, the CPU 32 controls the shutter curtain running detection means 37. As will be described later in detail, the light emitting diode 38 is turned on and a signal generated from the phototransistor 39 is received.

FIG. 4 is a perspective view of the shutter 8 described above. The substrate 13 and the cover plate 14 are arranged substantially parallel to each other with a predetermined interval, and a blade chamber 15 is formed between them. An opening 13a for exposure is formed on the substrate 13 at a position substantially equal to the aperture 6 of the camera 1, and an opening is also formed on the cover plate 14 at substantially the same position (not shown). There is. Reference numeral 16 denotes a drive mechanism including a spring of the shutter blades, and a shutter mechanism portion including an electromagnet for the time control. The shutter mechanism unit 16 includes a charging mechanism for charging the drive mechanism. On the side opposite to the shutter mechanism section 16 with the opening 13a interposed therebetween, the shutter curtain running detection means 37 is provided.
Are mounted on the substrate 13.

FIG. 5 is a sectional view taken along line BB of FIG. A front blade group 17 and a rear blade group 21 are provided in the blade chamber 15 at the opening 1
It is movably arranged between a position covering 3a and an opening position. The shutter curtain traveling detecting means 37 has a light emitting diode 38 and a phototransistor 39, and a front blade group 17 and a rear blade group 21 are provided from a detection hole 13b formed in the substrate 13 on the front surface of the shutter curtain traveling detecting means 37. To detect. That is, when the front blade group 17 or the rear blade group 21 exists at that position, the light from the light emitting diode 38 is reflected by the front blade group 17 or 21 and then enters the phototransistor 39. When there is no light, there is no incident light on the phototransistor 39. As a result, the shutter curtain running detection means 37 detects the front blade group 17 and the rear blade group 21.

FIGS. 6 and 7 are front views for explaining the operation of the leading blade group 17 and the trailing blade group 21.

The leading blade group 17 composed of a plurality of blades including the slit forming blades 17a has a pin 1 attached to two arms 18.
9 is rotatably supported, and two arms 18 are provided on the substrate 13
It is rotatably supported around the rotary shaft 20 that is planted above, and thus a link mechanism is configured. Rear blade group 21 including a plurality of blades including slit forming blades 21a
Also, the two arms 22 are rotatably supported by the pins 23, and the two arms 22 are rotatably supported around the rotation shaft 24 planted on the substrate 13. , Which constitutes a link mechanism. The slit forming blade 17
a and 21a have slit edge portions 17b, respectively.
And 21b are formed.

In FIG. 6A, the front blade group 17 has the opening 13
It shows a charging completed state in which the rear blade group 21 is folded over the opening 13a while covering the a. When the front curtain magnet (not shown) of the shutter mechanism section 16 is operated in this state, the front blade group 17 starts operating to start opening the opening 13a, and the exposure of the film is started. Figure 6 (b)
When the slit edge 17b comes to the position of the shutter curtain travel detecting means 37 as shown in FIG.
Since 7 has passed the position of the shutter curtain traveling detection means 37, the shutter curtain traveling detection means 37 reverses the output. The leading blade group 17 continues to travel further, reaching the state of FIG. 6C in which the opening 13a is opened, and the operation of the leading blade group 17 is completed.

After the exposure time has elapsed after the front curtain magnet was activated, the rear curtain magnet (not shown) of the shutter mechanism section 16 is activated in the state of FIG. 7A (same as FIG. 6C). Then, the rear blade group 21 starts to operate and starts to cover the opening 13a. As shown in FIG. 7 (b),
When the slit edge 21b reaches the position of the shutter curtain running detection means 37, the trailing blade group 21 begins to cover the shutter curtain running detecting means 37, so that the shutter curtain running detecting means 37 reverses the output and the trailing blade group. 21 continues traveling and reaches the state of FIG. 7C in which the opening 13a is covered,
When the operation of the rear blade group 21 is completed, the exposure is also completed.

Subsequently, the front blade group 17 and the rear blade group 21 are charged via the shutter mechanism section 16 by the motor and the shutter winding mechanism (both not shown), and FIG.
The state of (a) is restored.

FIG. 8 is a time chart showing the operation of the shutter 8 described above. The on / off timings of the front and rear curtain control magnets, the traveling states of the front and rear curtains, and the phototransistor. The detection signal of 39 is shown.

When the release button 10 (FIG. 1) is pressed, the front curtain magnet and the rear curtain magnet are energized and turned on, and the electric locking of the front curtain and the rear curtain is started. Here, the mechanical locking that was performed before the release button 10 was pressed is switched here.

In the subsequent photographing, a mechanical operation (not shown) first controls the aperture of the lens 2 to raise a reflecting mirror (not shown) in the photographing optical path.

Next, the front curtain magnet is turned off. As a result, the slit edge 17b of the slit forming blade 17a of the leading blade group 17 travels as shown by the running curve 40. Here, the range indicated by F indicates the vertical opening of the aperture 6. The output of the phototransistor 39 is inverted when the slit edge 17b of the front blade group 17 passes the front surface of the shutter curtain travel detecting means 37 after a lapse of tf time from turning off the front curtain magnet.

After the front curtain magnet is turned off, the trailing curtain magnet is turned off after a preset exposure time T has elapsed. As a result, the rear blade group 21
The slit edge 21b of the slit forming blade 21a travels as indicated by the running curve 41. Also at this time, after a lapse of tr from the turning-off of the rear curtain magnet, when the slit edge 21b of the rear blade group 21 passes the front surface of the shutter curtain traveling detection means 37, the output of the phototransistor 39 is reversed.

By measuring the time t from the rise to the fall of the inversion timing of the phototransistor 39 obtained as described above, it can be known that the true exposure time was t.

Even if the exposure control circuit (not shown) correctly measures the exposure time T to drive the front curtain magnet and the rear curtain magnet at the correct timing, the phototransistor 3
If the control time t obtained from 9 is different from the exposure time T, it can be determined that the mechanical system has malfunctioned.

Further, by measuring the times tf and tr respectively, it is possible to grasp the running time (curtain speed) of the front curtain and the rear curtain. When the times tf and tr are longer than the standard value, the curtain traveling is slow, and conversely, when the times tf and tr are shorter than the standard value, it can be determined that the curtain traveling is too fast, and uneven exposure can be determined.

9 and 10 are top views detailing the operation system of the top surface of the camera 1 according to the present invention. In the first embodiment (FIG. 9), the setting button 11 shown in FIG.
Is composed of a mode switch 11a for switching between the normal photographing mode and the shutter inspection mode, and a T switch 11b for setting the shutter speed in the inspection mode. FIG. 10 shows a second embodiment of the present invention. The setting button 11 shown in FIG. 1 is composed of a mode switch 11a, an N switch 11c, a T1 switch 11d, a T2 switch 11e, and a T3 switch 11f which will be described later. There is. It should be noted that these switches are turned on if they are both pressed, and turned off if they are not pressed.

The camera of the present invention is constructed so that it can be switched between a normal mode in which normal photographing is performed and an inspection mode in which only shutter inspection is performed. The switching method is the normal mode when the mode switch 11a shown in FIG. 9 or 10 is not pressed, and the mode switch 11a
It is configured to enter the inspection mode when is pressed.

FIG. 11 is a flow chart for explaining the camera processing routine according to the present invention by the CPU 32 shown in FIG. This routine is repeatedly executed while power is being supplied.

When the processing routine starts, first in step S
1, the state of the mode switch 11a is read via the switch detection means 28 and the process proceeds to step S15. In step S15, if the mode switch 11a is on, the process proceeds to step S151, and if it is off, step S3.
Proceed to. In step S151, the switch detection means 28
The state of the film detection switch 29 is read via
When the film is loaded, the process proceeds to step S3, and when not loaded, the process proceeds to step S16.

In step S16, an inspection mode routine for inspecting the shutter is executed. Details of the inspection mode routine will be described with reference to FIGS. 15 to 16 (first embodiment of inspection mode) and FIG. 17 (second embodiment of inspection mode). This routine (step S16)
After completing the step, the process proceeds to step S3.

In step S3, the photometric signal and the sensitivity signal are fetched from the photometric means 26 and the sensitivity detecting means 27, respectively. In step S4, the photometric signal and the sensitivity signal are calculated to calculate the shutter speed and aperture value that are the proper exposure conditions. In step S5, the exposure conditions and the like obtained above are displayed on the LCD 34.

In step S6, the release button 1
It is determined through the switch detection means 28 whether 0 has been pressed. If the release button 10 has not been pressed, the process returns to step S1 and the above process is repeated. If the release button 10 has been pressed, the front curtain magnet and the rear curtain magnet are first turned on as described with reference to FIG. 8 (step S7), and then the process proceeds to step S8.

In step S8, a reflecting mirror (not shown) is raised and retracted from the photographing optical path. In step S9, the diaphragm 35 is controlled to have a predetermined diaphragm aperture.

In step S10, a shutter routine for controlling the exposure of the film by opening and closing the shutter 8 and a shutter curtain traveling state detecting routine by the shutter curtain traveling detecting means 37 are executed. The details of the shutter routine and the shutter curtain traveling state detection routine are shown in FIG.
2 and FIG.

In step S11, the second data detected by the shutter curtain travel detecting means 37 is evaluated. Details of the evaluation of the second data will be described with reference to FIG.

Since the exposure operation is completed when the next step S12 is reached, the shutter motor 36a is normally rotated to charge the shutter 8.

In step S13, the film motor 36b is normally rotated to feed the film.

In step S14, the mirror motor 3
6c is normally rotated to reset the mirror down and the aperture. Then, the process returns to step S1.

12 and 13 are flow charts for explaining the details of the shutter routine (step S10).

In step S17, the shutter time T set in step S4 is read.

In step S18, the energization of the front curtain magnet is terminated and the front blade group 17 starts to travel.
After this, the processes starting from step S19 and step S23 are executed simultaneously. For the sake of clarity, the shutter time T in this embodiment is set to be sufficiently longer than the traveling time of the front blade group 17 and the rear blade group 21.

As one of the processes simultaneously executed, in step S19, the shutter time T is started.
In step S20, the completion of timing of the shutter speed T is awaited. In step S21, since the shutter time T has elapsed, the power supply to the rear curtain magnet is terminated, and the rear blade group 2
Start to run 1. In step S22, measurement of the measurement time tf is started, and then step S28 (FIG. 13).
Leading to.

As the other process executed simultaneously, in step S23, the measurement time t
Start timing of f. In step S24, the light emitting diode 38 is turned on. In step S25,
It waits for the output of the phototransistor (PTR) 39 to be inverted by passing through the slit edge 17b of the front blade group 17. In step S26, the measurement of the measurement time tf is completed. In step S27, the clocking of the clocking time t is started, and step S28 (FIG. 13) is reached.

In step S28 (FIG. 13), the process waits until the output of the phototransistor 39 is inverted due to the passage of the slit edge 21b of the rear blade group 21. Step S
At 29, the clocking of the clocking time t is completed. In step S30, the measurement of the measurement time tr is completed. In step S31, since the measurement is completed, the light emitting diode 38 is turned off, and the process returns to step S11 in FIG.

FIG. 14 is a flow chart for explaining the details of the second time data evaluation routine in step S11 of FIG.

When the routine starts, first, step S32
At, it is determined whether or not the measured time t is within a predetermined permissible time width with respect to the shutter time T. If it is within the allowable time width, the process proceeds to step S34. If the time has deviated from the permissible time width, a second warning is given (step S33), and then the process proceeds to step S34. This second-hour warning is a notification that the exposure time does not satisfy the predetermined value.

In step S34, it is determined whether the traveling time tf of the front blade group 17 is within the predetermined time width. If it is within the predetermined time width, the process proceeds to step S35. If the time has deviated from the predetermined time width, a warning to that effect is given (step S36), and then step S12.
(Fig. 11).

In step S35, it is determined whether the traveling time tr of the rear blade group 21 is within a predetermined time width. If it is within the predetermined time width, immediately step S12 (see FIG.
Go to 1). If it has deviated from the predetermined time width, a curtain speed warning to that effect is given (step S36), and then the process proceeds to step S12 (FIG. 11).

FIG. 15 is a flow chart for explaining the first embodiment of step S16 (inspection mode processing routine) of FIG. 11 in detail. The shutter speed to be inspected is 1
It is a type, and the number of inspections is one.

In step S37, a predetermined shutter speed (for example, maximum speed) T for inspection is set. The shutter speed T set in step S37
Is displayed on the LCD 34 in step S38.

In step S39, the state of the mode switch 11a is judged through the switch detecting means 28. If the mode switch 11a is on, step S4
If it is off, the inspection mode is interrupted and the process returns to step S3 in FIG.

In step S40, the state of the T switch 11b is judged via the switch detecting means 28. T
If the switch 11b is on, the process proceeds to step S42,
If it is off, the process proceeds to step S41. In step S41, the release button 10 is operated via the switch detecting means 28.
Determine the state of. If the release button 10 is not pressed, the process returns to step S40, and if it is pressed, the process proceeds to step S45 described later.

When it is determined in step S40 that the T switch 11b is turned on, the shutter time T set in step S37 is changed in step S42. The method of changing the shutter time T is, for example, 1 Ev to the low speed side every time the ON state of the T switch 11b is detected. Next to the shutter speed at the low speed limit, the circuit patrols at the highest shutter speed. Then, the process proceeds to step S43, and step S
The shutter speed T changed at 42 is displayed on the LCD 34. In step S44, the state of the T switch 11b is judged through the switch detecting means 28. If the T switch 11b is on, the process returns to step S44, waits until the T switch 11b is turned off, and returns to step S40.

In step S45, the release button 10
Since is pressed, the front curtain magnet and the rear curtain magnet are first turned on as described with reference to FIG.

In step S46, the shutter routine for opening and closing the shutter 8 to control the exposure of the film described with reference to FIGS. 12 and 13 and the shutter curtain traveling state detecting routine by the shutter curtain traveling detecting means 37 are executed. Next, in step S47, the evaluation routine described in FIG. 14 is executed. Further, in step S48, since the exposure operation is completed, the shutter is charged, and the process proceeds to step S3 (FIG. 11).

In order to execute the inspection at the inspection shutter time T set in step S37, the release button 10 may be pressed without pressing the T switch 11b even once. Further, in order to change the inspection shutter time T in several steps, the T switch 11b may be pressed the number of times. For example, the T switch 11b may be pressed three times to change it in three steps.

Further, when the processing routine is such that the inspection shutter time T does not have to be changed, step S40 and steps S42 to S44 may be omitted. In this case, the T switch 11b is also unnecessary.

16 and 17 are flowcharts for explaining the second embodiment of step S16 (inspection mode processing routine) of FIG. In this embodiment, a plurality of shutter speeds to be inspected can be set, the number of inspections can be set to a plurality of times, and the inspection is automatically executed under the set conditions.

When the processing routine is started, the number of inspections N is set to 1 in step S49. In step S50, a plurality of inspection shutter speeds are set. Here, the inspection shutter speed T is set to two types, Ta and Tb, and the memory (T memory 32a) in the CPU 32 is used.
The description will be made on the assumption that they are stored in the addresses I0 and I0 + 1.

In step S51, the inspection shutter time T and the inspection number N are displayed on the LCD 34. Step S
At 53, the state of the N switch 11c is judged through the switch detection means 28, and if the N switch 11c is on, the process proceeds to step S56, and if the N switch 11c is off, the process proceeds to step S54.

In step S52, the state of the mode switch 11a is judged via the switch detecting means 28. If the mode switch 11a is on, step S5
If it is off, the inspection mode is interrupted and the process returns to step S3 in FIG.

When it is determined in step S53 that the N switch 11c is turned on, the inspection number N is incremented in step S56, and the changed inspection number N is displayed on the LCD 34 in step S57. Step S58
At the N switch 1 via the switch detection means 28.
1c, if the N switch 11c is on, the process returns to step S58 to repeat the process.
It waits until 1c is turned off and returns to step S53.

If it is determined in step S53 that the N switch 11c is off, in step S54 the state of the T1 switch 11d is determined via the switch detection means 28, and if the T1 switch 11d is on, step S5
9. If the T1 switch 11d is off, the process proceeds to step S55.

In step S54, the T1 switch 1
When 1d is determined to be on, the setting of the plural types of inspection shutter time T set in step S50 is changed (step S59). Details of the processing in step S59 are shown in FIG.
As will be described in Section 8, a plurality of changed inspection shutter speeds T
(For example, Tc, Td, ...) Are set to the I-1 address in order from the I0 address of the T memory 32a in the CPU 32.

In step S54, the T1 switch 1
When it is determined that 1d is off, the release button 10 is operated via the switch detection means 28 in step S55.
Determine the state of. If the release button 10 has not been pressed, the process returns to step S52. If the release button 10 is pressed, step S60 (FIG. 17)
Proceed to.

When it is determined in step S55 that the release button 10 is pressed, step S6
0 (FIG. 17). In step S60, T in the CPU 32 in which a plurality of inspection shutter speeds T are set.
The address information of the memory 32a is stored in J.

In step S61, the initial address of the T memory 32a in the CPU 32 in which a plurality of inspection shutter speeds T are set is stored in K. In step S62, the inspection number N is stored in the counter Ni. In step S63, the front curtain magnet and the rear curtain magnet are turned on as described in FIG.

In step S64, the shutter routine for opening and closing the shutter 8 to control the exposure of the film described with reference to FIGS. 12 and 13 and the shutter curtain traveling state detecting routine by the shutter curtain traveling detecting means 37 are executed. In step S17 of FIG. 12, as the inspection shutter time T, the shutter time stored in the K address of the T memory 32a in the CPU 32 is read.

In step S65, step S64
Is executed once, the measured time t, measured time tf and tr
Therefore, these time data are stored.

Since the exposure operation is completed, the shutter 8 is charged in step S66.

In step S67, the counter Ni is decremented by 1.

In step S68, it is determined whether the inspection has been performed the set number of times. If the set number of inspections has not been completed, the process returns to step S63,
The process of steps S63 to S67 is repeated, and the clocked time t and the measured time t obtained each time one exposure operation is performed.
The time data of f and the measurement time tr is stored.
When the set number of inspections is completed, the process proceeds to step S69.

In step S69, the address of the T memory 32a in the CPU 32 is increased by 1.

In step S70, step S6
At 5, the time data of the measured time t, the measured time tf, and the measured time tr stored in the T memory 32a is calculated as necessary.

In step S71, the evaluation routine described with reference to FIG. 14 is executed to evaluate the measured time t, the measured time tf, and the measured time tr calculated in step S70.

In step S72, it is determined whether or not all the set plural kinds of inspection shutter speeds have been inspected.
If the plurality of types of inspections that have been set have not been completed, the process returns to step S62, the processes of steps S62 to S71 are repeated, and the inspection times stored in the T memory 32a are sequentially inspected N times each. When the inspection is completed, the process returns to step S3 in FIG.

FIG. 18 is a flow chart for explaining the details of routine step S59.

In step S73, the state of the N switch 11c is determined through the switch detecting means 28, and the operation is repeated while the switch is on, and if it is off, the process proceeds to step S74.

In step S74, the address counter I is set to I0. In step S75, the inspection shutter time set in step S50 is cleared.
In step S76, the inspection shutter time (for example, the maximum speed) is set in the T set memory 32b in the CPU 32. In step S77, the time set in step S76 is displayed on the LCD 34. Step S
At 78, the state of the T2 switch 11e is judged via the switch detecting means 28. If on, step S
If it is off, the process proceeds to step S82.

In step S79, step S7
Since the T2 switch 11e was turned on at 8, the inspection shutter time set in the T set memory 32b is stored in the I address of the T memory 32a. In step S80, the address counter I is incremented by 1. In step S81, the T2 switch 1 is operated via the switch detecting means 28.
Judge the state of 1e. If it is on, this process is repeated, and if it is off, the process proceeds to step S83.

In step S82, step S7
Since the T2 switch 11e is off at 8, the address counter I is judged. If the address is I0, the process proceeds to step S84, and if it is not the address I0, the process proceeds to step S83. In step S83, the T2 switch 1 in step S81.
Since 1e is off or the address counter I is not I0 at step S82, the state of the T1 switch 11d is judged through the switch detecting means 28. If the T1 switch 11d is on, the process returns to step S55 in FIG. 16, and if the T1 switch 11d is off, the step S84.
Proceed to.

In step S84, the state of the T3 switch 11f is judged through the switch detection means 28, and if it is on, the process proceeds to step S85, and if it is off, the process returns to step S77. In step S85, the T3 switch 11f was turned on in step S84, so T
The shutter speed T set in the set memory 32b is changed. The way of changing the shutter speed is, for example, 1 Ev to the low speed side each time the ON state of the T3 switch 11f is detected once. After the shutter speed at the low speed limit, the cycle is repeated at the maximum shutter speed. In step S86,
The state of the T3 switch 11f is judged through the switch detecting means 28, and if the T3 switch 11f is on, step S86 is repeated, and after the T3 switch 11f is turned off, the process returns to step S77.

In order to execute the inspection at the inspection shutter time T (Ta and Tb) set in step S50, the release button 10 may be pressed without pressing the N switch 11c even once. To change the number of inspections, step S
It suffices to press the N switch 11c 53 times as many times as necessary. For example, to set the number of inspections to 3, N switch 11
Press c twice. Further, the inspection shutter time can be set according to the number of times the N switch 11c is pressed in step S54.

Furthermore, in the above-described embodiment, the evaluation of each measurement time is performed for each inspection shutter time, but the evaluation may be collectively performed at the end. If at least the film is not fed, the mirror mechanism and the diaphragm mechanism may be operated. Although the inspection is executed in the normal mode in the above-described embodiment, if the inspection is not executed, step S11 is omitted in the processing routine of FIG. 11, and the step of the shutter routine (FIGS. 12 and 13) executed in step S10 of FIG. Processing other than S18 and step S21 may be omitted.

According to the first embodiment described above, by executing the inspection mode, the photographer can inspect any shutter speed and can know the shutter malfunction in advance. The effect is obtained. Further, according to the second embodiment, the inspection can be automatically performed a plurality of times at a plurality of shutter speeds, so that the inspection can be efficiently performed.

In the above embodiments, the case where the present invention is applied to the focal plane shutter has been described, but the present invention can also be applied to the inspection of the exposure time of the lens shutter.

[0103]

As described above, according to the camera of the present invention, the normal mode and the inspection mode are switched regardless of the driving of the driving mechanism, so that only the shutter inspection is performed independently of the photographing. It becomes possible to do.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a camera according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a camera according to the present invention.

FIG. 3 is a block connection diagram showing an embodiment of a camera according to the present invention.

FIG. 4 is a perspective view showing an embodiment of a camera according to the present invention.

FIG. 5 is a sectional view showing an embodiment of a camera according to the present invention.

FIG. 6 is a front view showing an embodiment of a camera according to the present invention.

FIG. 7 is a front view showing an embodiment of a camera according to the present invention.

FIG. 8 is a timing chart showing an embodiment of a camera according to the present invention.

FIG. 9 is a top view showing an embodiment of a camera according to the present invention.

FIG. 10 is a top view showing an embodiment of a camera according to the present invention.

FIG. 11 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 12 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 13 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 14 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 15 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 16 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 17 is a flowchart showing an embodiment of a camera according to the present invention.

FIG. 18 is a flowchart showing an embodiment of a camera according to the present invention.

[Explanation of symbols]

 1 Camera 2 Lens 3 Finder 5 Patrone Room 6 Aperture 7 Spool 8 Shutter 10 Release Button 11 Setting Button 11a Mode Switch 11b T Switch 11c N Switch 11d T1 Switch 11e T2 Switch 11f T3 Switch 12 Display Means 13 Board 13a Opening 13b 14 cover plate 15 blade chamber 16 shutter mechanism section 17 leading blade group 17a slit forming blade 17b slit edge 17b slit edge section 18 arm 19 pin 20 rotating shaft 21 trailing blade group 21a slit forming blade 21b slit edge 22 arm 23 pin 24 rotating shaft 25 battery 26 photometric means 27 film sensitivity detecting means 27 sensitivity detecting means 28 switch detecting means 29 film detecting switch 29a contact piece 32 CPU 3 a T memory 32 b T set memory 33 driver means 34 LCD 36 motor 36a shutter motor 36b films motor 36c mirror motor 37 shutter curtain running detecting means 38 the light emitting diode 39 the phototransistor 40 traveling curve 41 traveling curve

Claims (12)

[Claims] 1. A shutter means for limiting an exposure time to a recording medium, a measuring means for measuring a time for which the shutter means exposes the recording medium according to an operation of the shutter means, the shutter means, and A switching mechanism that switches between a driving mechanism that drives a mechanism other than the measuring unit, a normal mode that drives the shutter unit and the driving mechanism to perform a photographing operation, and an inspection mode that drives the shutter unit and the measuring unit. A camera characterized in that the drive mechanism is not driven in the inspection mode. 2. A mode switching member which can be operated externally and which generates a predetermined signal in response to the operation, wherein the switching means switches between the two modes depending on the presence or absence of the predetermined signal. The camera according to claim 1, wherein the camera is a camera. 3. A loading detection means for generating a predetermined signal when detecting that the recording medium is not loaded in the camera, wherein the switching means performs the inspection when the predetermined signal is generated. The camera according to claim 1, wherein the camera is switched to a normal mode and switched to the normal mode when the predetermined signal is not generated. 4. A release means that can be operated externally and that activates the shutter means, and a number setting means that operates by one operation of the release means and that can arbitrarily set the number of times of operation of the shutter means. The camera according to claim 1, further comprising invalidating means for invalidating the setting of the number of times setting means in the normal mode. 5. The camera according to claim 1, further comprising a shutter time setting means capable of arbitrarily setting the exposure time. 6. An externally controllable release means for activating the shutter means, wherein the shutter time setting means is capable of setting a plurality of different exposure times in the inspection mode, and in the inspection mode. When the release means is operated,
The camera according to claim 5, wherein the shutter unit operates a plurality of times at the set plurality of exposure times. 7. The camera according to claim 1, wherein the recording medium is a photographic film, and the drive mechanism is a feeding mechanism for the photographic film. 8. The camera according to claim 7, wherein the drive mechanism includes at least one of an aperture drive mechanism and a mirror drive mechanism. 9. The measuring means operates in response to the photographing operation in the normal mode.
The camera described in. 10. A shutter means for limiting an exposure time to a recording medium, a measuring means for measuring a time for the shutter means to expose the recording medium according to an operation of the shutter means, the shutter means, and A switching mechanism that switches between a driving mechanism that drives a mechanism other than the measuring unit, a normal mode that drives the shutter unit and the driving mechanism to perform a photographing operation, and an inspection mode that drives the shutter unit and the measuring unit. A camera having: 11. A shutter means for limiting an exposure time to a photographic film, a measuring means for measuring a time for which the shutter means exposes the photographic film according to an operation of the shutter means, and a shutter for the photographic film. A hoisting means for hoisting, a switching means capable of switching between a normal mode for operating the hoisting means when the operation of the shutter means is completed, and an inspection mode for prohibiting the operation of the hoisting means. A camera to do. 12. A shutter means for limiting an exposure time to a recording medium, a measuring means for measuring a time for which the shutter means exposes the recording medium according to an operation of the shutter means, and the recording medium. Based on a detection result of the loading detection unit, a loading detection unit that detects whether the recording medium is loaded, an inspection mode that is set when the recording medium is not loaded, and a normal mode that is set when the recording medium is loaded. The camera according to claim 1, further comprising a switching unit that can switch the camera.