JPS6214128A - Setting device for photometric mode of camera - Google Patents

Abstract

PURPOSE:To improve the switching operation of respective photometric modes by forming a photometric mode switching member so that an average photometric mode, a partial photometric mode, a highlight reference mode, and a shadow reference mode are independently switched. CONSTITUTION:A photometric mode switching dial 9 for switching the photometric modes, e.g. AVERAGE: average photometry, STOP: partial photometry, H: highlight, and S: shadow, is arranged on the rewinding side upper part of an upper cover 2 of a camera body 1 and respective modes can be independently switched only by the rotation of the dial 9. The reference mode and the shadow reference mode are set up on positions adjacent to a spot photometric mode. When the photometric mode is switched to the highlight reference mode or the shadow reference mode, a partial photometry reference exposing level is set up and the level is shifted only in the operation of an AE lock button.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an improvement in a photometry mode Y setting device for a camera.

(Prior art) Conventionally, in an eye reflex camera, etc., the photometry mode (for example, AVERAGE: average photometry, 5P
There is a camera that allows you to switch between OT: partial metering, H: highlight, and S: shadow.

By the way, conventional cameras have a partial metering button, a highlight button, and a shadow button, and are normally set to average metering mode, and when you press the partial metering button, you can switch to partial metering mode mainly by releasing the button. It has been proposed that when the light button or shadow button is pressed, the partial photometry reference exposure level is shifted, and when the release is completed or the clear lever is operated, the seven elements are cleared.

Partial metering mode is cleared after each shot, so even if you need to perform partial metering continuously,
You need to press the partial metering button again each time. In this case, it is also possible to store memory using the memory lever, but it only stores the partial metering value at the time of shooting, not the mode memory, so if you want to change the metering target, press the partial metering button again each time. There was a need.

Also, highlights and shadows are not mode switching,
If the highlight button or shadow button is forged, the partial photometry reference exposure level will be shifted into memory and will not be cleared until the release is released, so if you want to change the photometry target, you will need to clear it with the clear lever and reset it. was there.

Furthermore, in the case of highlights and shadows, it was necessary to double-operate each time by pressing the partial metering button and then pressing the /'% (light button or shadow button).

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and its basic purpose is to improve the switching operation of each photometry mode.

(Structure of the Invention) Therefore, the present invention provides a camera having a photometry mode switching member capable of switching the photometry mode by external operation, wherein the photometry mode switching member has an average photometry mode, a partial photometry mode,
It is provided so that four modes, the highlight reference mode and the shadow reference mode, can be switched independently.The highlight reference mode Y and the shadow reference mode are set at a position close to the spot metering mode. The reference mode and shadow reference mode Y are provided with a control circuit that sets the exposure level to the partial photometry reference exposure level when the photometry mode Y is switched to these modes, and shifts the level only while the AE lock button is operated. Vt? iI.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the upper and lower parts of the camera body 1 are covered by an upper cover 2 and a lower cover 3, respectively.
The front central part of the camera body 1 is covered with a front cover 5 to which a mount 4 is attached, the side part of the camera body 1 on the winding side (patrone chamber side) is covered with a side cover 6, and the winding side of the camera body 1 ( The side portion (on the spool chamber side) bulges forward to form a grip portion 7 that also serves as a battery holder.

The upper part of the upper cover 2 of the camera body 1 on the rewind side shows the photometry mode (for example, AVERAGE: average photometry, 5P).
A metering mode switching dial 9 is provided to switch between OT: partial metering, H: )-illite, and S: shadow), and an up-down lever 10 for setting exposure information is provided on the side of the front cover 5 on the rewind side. It is being The mounting structure of the photometry mode switching dial 9 will be described in detail later.6 At the inside position of the upper part of the winding side of the upper cover 2 of the power camera body 1, there is a setting for the shooting mode (for example, P mode: program A).
E shooting, A mode: two-aperture priority AE shooting, S mode: shutter speed priority AE shooting, M mode: manual shooting)
A photographing mode switching dial 11 is rotatably provided to switch the photographing mode.
and has exposure-related information (e.g. shutter speed (250
), aperture value (F5.6))
An up-grain lever 13 for setting exposure information is provided at the front portion of the winding side of the upper cover 2 along with the photographing mode switching dial 11.

A winding lever 14, a film counter 15, and a main switch 16 are arranged on the outer side of the upper part of the winding side of the upper cover 2 of the camera body 1, and an AE lock button 17 is arranged at the rear of the winding side of the upper cover 2. is provided.

A release button 18 and a self-release button 19 are provided in parallel on the upper part of the grip section 7.

In addition, in FIG. 1, 20 is a lighting window, 21 is an accessory shoe, 22 is a finder frame, and in FIG. 2, 23 is a self-display window, 24 is a lens attachment/detachment button,
2S is a hanging fitting.

On the other hand, on the upper surface 2e of the upper part on the unwinding side of the upper cover 2,
Along the outer periphery of the photometry mode switching dial 9, AVERAGE (average photometry) and 5PO display each photometry mode.
T (partial metering), H (highlight), S (shadow)
The marks are engraved in sequence.

Therefore, each mode can be switched independently only by rotating the photometry mode switching dial 9, and the set mode is not cleared every time a photograph is taken.

In addition, the H mark and S mark are set close to the 5POT mark, which makes it possible to quickly switch the metering mode Y switching dial 9 to the 5POT mark and then to the L mark or S mark. .

Further, the interval between the AVERAGE mark and the 5POT mark is set to be wide, so that the operational feel of the photometry mode switching dial 9 is different, so that erroneous operation can be prevented.

In addition, next to the H mark and S mark, there is an AE lock button 17 for highlight reference mode and shadow reference mode.
An AEL mark is engraved to indicate that it is shifted by the operation.

Specifically, as shown in FIGS. 4 and 5, the photometry mode switching dial 9 is installed in a substrate 50 provided at the top of the camera body 1, and is inserted upward from the hole 2 of the upper cover 2. At the top of the protruding pongee S1, attach the collar 52 and set screw 5.
3) It is rotatably mounted.

A photometering mode switch holder 54, an upper cover 2, a click ball receiver 55, a photometering mode index plate S6 are fitted into the middle part of the shaft 51 from bottom to top, and are removed using a retaining nut 57. has been stopped.

On the upper surface of the photometry mode index plate 56, connecting grooves 9a, . . . , formed on the inner peripheral surface of the photometry mode switching dial 9,
A connecting boss 56a that can be engaged with the connecting boss S6a is provided in the connecting groove 9a, and the photometric mode indicator plate 56 is interlocked with the photometric mode switching dial 9 by the engagement of the connecting boss S6a and the connecting groove 9a.

A of the upper cover 2 is provided on the outer peripheral surface of the photometry mode index plate 56.
A photometry mode indicator 58 indicating one of the VERAGE-S marks is engraved.

The click ball receiver 55 is fixed to the upper surface of the hole 2f of the upper cover 2, and the click ball receiver 55 is provided with a click ball 60 that is urged upward by a spring board 59. , the photometry mode indicator plate 5
The click grooves S6b and S6b provided on the lower surface of the holder 6 are click-engaged. The click grooves 56b, 56b
are provided corresponding to the IJl intervals of the AVERAGE-S marks engraved on the upper cover 2.

In addition, click groove 56 corresponding to the AVERAGE mark
If b is set so that the click force increases even when going up the click groove 56b of the pond, erroneous operation can be prevented due to the difference in the operation feeling.

On the top surface of the photometry mode changeover switch holder 54,
An interlocking boss S4a is provided that can be inserted through the elongated hole 55a of the click ball receiver 55 and engaged with an interlocking groove 56c formed on the lower surface of the photometry mode index plate S6, and the interlocking boss 54a and the interlocking groove S6c are engaged with each other. As a result, the photometry mode switching dial 9, the photometry mode indicator plate 56, and the photometry mode switch holder 54 come to be interlocked.

A trident-shaped photometry mode switching movable contact 61 is attached to the bottom surface of the photometry mode switching switch holder 54, and on the other hand,
Photometry mode switching fixed contacts G3a (GND), 63b (SH), 63 are mounted on the base plate 62 provided on the substrate 50.
c (SS) (see Figure 3) is attached, and the contact position of the movable contact 61 and the fixed contacts 63a to 63 can be switched by rotating the photometry mode switching dial 9. .

That is, at the AVERAGE mark position, switches SH and S
Both S are off, and switch SH is in the 5POT mark position.
is on, switch SS is off, at the H mark position both switches SH and SS are on, and at the S7- position, switch SH is off and switch SS is on.

FIG. 6 shows the control circuit of the camera, and 65 is a control microphone, which performs sequence control of the camera.

RO and Co constitute a power-up clear circuit, and when a battery is installed in the camera, the CLR momentarily clears 4 children. After this, the control microphone 6 is activated by the rise of the CLR terminal.
5 is a reset start. All resistors other than RO are pull amplifier resistors.

SPI and SP2 are photometric elements for average photometry and partial photometry, respectively.

66 is a photometry section, which includes photometry elements SPI and SP2.
Each has a corresponding head amp.

This output is appropriately selected by an A/S (average photometry/partial photometry) signal and transmitted to the A/D converter 67. Here, the photometric value is A/D converted and sent to the control microcomputer 65 as a digital value.

Reference numeral 68 denotes a display section, which displays the results of calculations by the control microcomputer 65, such as self-operation.

69 is an exposure control unit, and 7 mirror up/down,
Controls shutter speed and aperture.

70 is a photographic lens, which has an aperture F value (AVO) and a minimum F value.
The value (AVmax) is transmitted to the control microcomputer 65.

71 is a DX code (code-like information shown on the film cartridge) reading unit, which reads l5 from the film.
O (film sensitivity) information is manually input and transmitted to the control microcomputer 65.

IP1 to IP13 of the control microphone 65 are all input ports.

SH and SS are the above-mentioned photometry mode switching switches,
This combination selects the average photometry mode P, partial photometry mode, highlight reference mode P, and shadow reference mode. Further, these switches SH and SS serve as the input for the AND gate, and the output thereof becomes the A/S signal. That is, if even one of the switches SH and SS is turned on, partial photometry is performed, and if both are turned off, average photometry is performed.

SL is a photometry start switch, S2 is a release switch, and 5AEL is an AE lock switch.

SM is a main switch, and 5SLF is a self mode setting switch. 5TtJ, STD, 5AtJ, and SAD are up/down switches for the TV fixed value and AVV fixed value, respectively.

SMDO and SMDI are shooting mode selection switches, and depending on the combination, P mode (program AE shooting)
, A mode (aperture priority AE photography), S mode (shutter speed priority AE photography), and M mode (manual photography) is selected.

FIG. 7 is a 70-chart showing the operation of the control circuit of FIG.

First, when a power supply is attached to the control microcomputer 65, the (STAR) S), input board, and RAM are initialized (step 1).

Next, if the main switch SM is off (step 2
), the display is completely turned off (step 3), the AE lock flag (described later) is reset (step 6), and the process returns to step 2 again to determine whether the main switch SM is active. That is, while the main switch SM is off, all the displays are off and all switches other than the main switch 8M are turned off.

When the main switch SM is turned on, the process proceeds to step 4, where the photometry start switch S1 and the AE lock switch 5AE are turned on.
Make a determination of L. If both are off, the display is set to standby (not shown) in step 5), the AE lock flag is reset (step 6), and the process returns to step 2. That is, simply turning on the main switch SM only puts the display in the standby state.

If at least one of the photometry start switch S1 or the AE lock switch 5AEL is turned on, the process advances to step 7 and photometry is started.

Then read the DX code (step 8) and enter 5
Input as V (ISO information) value. At this time, if D
If there is no X code, film sensitivity 15O100 is set as the SM value.

Next, the photometry mode switches SMDO and SMDI are determined to determine the shooting mode (step 9), and the shooting lens 70 is
Read the open F value AVO1 minimum F value AVmax from (
Step 10). and up/down switch STU,
STD, SAU, and SAD are determined and the setting values are changed according to the L'C photographing mode or the presence/absence/type of the photographing lens 70 (step 11).

Next, in step 12), the AE lock flag is determined.
If the lock flag is not set, the photometric value (BV
O) is loaded (ste knob 13). and photometric value BV
The BV (brightness) value is determined by adding O and the open F value AVO, and the EV value (copy brightness value) is determined by further adding the BV value. Here, the presence or absence of AE lock is determined using the AE lock flag.
This is because when started with L, it is necessary to read the photometric value - times.

In step 14, determine the AE port and 5AEL, and if it is off, reset the AE lock flag (step 15), and if it is on and set the AE lock flag (step 16). .

If the AE is locked, the photometry mode changeover switch SS is further determined (step 17), and if it is on, the photometry mode changeover switch SH is determined (step 18).
.

The combination of the photometry mode changeover switches SS and SH selects one of the partial or average photometry standard, the light standard, and the shadow standard. At this time, when the highlight standard is selected, the EV value is subtracted by 2°3 EV (step 19), resulting in overexposure, and when the shadow standard is selected, the EV value is added by 2.7 EV (step 20). The exposure will be from below.

Next, a TV value (shutter speed) and an AV value (aperture value) for exposure control are determined using this EV value and set values depending on the photographing mode (step 21), and are displayed (step 22).

Then, press the release switch S2 (Step 23)
, if it is off, the process returns to step 2 and the above routine is executed again. If the release switch 82 is on,
If the self-switch is determined (step 24), and the self-switch 5SLF is off, exposure control is performed (step 26), and after the exposure is completed, the process returns to step 2 and the above-mentioned routine is executed again.

release switch S2, self switch 5SLF
If both are on, the process advances to step 25 and a self-routine is executed. Self-routine is the above-mentioned photometry, calculation,
This is a routine that displays for 10 seconds.For details, see steps 8.9.10.13.14 (determined by the AE lock flag), 17.1B, and 19.20.21.2.
Contains 2.

Further, in the self routine, there is a determination of the main switch SM, and if the main switch SM is turned off during the self routine, the process returns to step 2 and the self routine is canceled.

After the self-routine continues for 10 seconds, the process proceeds to step 2G and exposure control is performed in the same way as when the self-routine is not performed.

(Effects of the Invention) According to the present invention, each mode of average metering, partial metering, highlight standard, and shadow standard can be switched independently using the metering mode switching member, so even when shooting many times. Since there is no need to reset the settings, there is no need to perform switching operations every time a photograph is taken, and operability is improved.

In addition, highlight reference mode and shadow reference mode are
One approach position for partial metering mode is set, so switching operations can be performed quickly, and average metering mode and partial metering mode (highlight reference mode, shadow reference mode) can be set at a wider interval or with different switching forces. Since it is possible to vary the scratching sensation, erroneous operations can be prevented, and operability can be improved from these points.

Furthermore, after switching to highlight reference mode or shadow reference mode, the control circuit shifts the level by operating the AE lock button. Even in this case, if you forget to return to the average metering mode or partial metering mode, the partial metering standard exposure level is set, so there is less risk of a photographic error occurring.

In addition, in each mode, AE is activated only when the AE lock button is operated.
Since you can shift either the highlight or the shadow, it is easy to switch even when changing the photometric target many times. In addition, by operating the AE lock button,
AE lock is possible with either average metering or partial metering.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a camera equipped with a photometry mode setting device according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a plan view of a fixed contact, and Fig. 4 is a plan view of a photometry mode setting device. 5 is a sectional view of the device shown in FIG. 4, FIG. 6 is a block diagram of a control circuit, and FIG. 7 is a flowchart of the circuit shown in FIG. 6. 1... Camera body, 9... Metering mode switching dial, 17... AE lock button, 65... Control microphone, AVERAGE... Average metering mode, 5POT...
Partial metering mode, H...Highlight reference mode, S...Shadow reference mode. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Blue and White Blue Two Baka No. 4111 53D%5MJ 61

Claims (1)

[Claims] (1) In a camera that has a metering mode switching member that can switch the metering mode by external operation, the metering mode switching member has four independent modes: average metering mode, partial metering mode, highlight reference mode, and shadow reference mode. The highlight reference mode and shadow reference mode are set close to the spot metering mode, and the highlight reference mode and shadow reference mode are set so that the metering mode can be switched to these modes. 1. A photometry mode setting device for a camera, characterized in that a control circuit is provided which sets the partial photometry reference exposure level when the exposure level is changed and shifts the level only while an AE lock button is being operated.