JPS5911886B2 - exposure control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to flash photography using an exposure control device, particularly a dimming type flash device (hereinafter abbreviated as dimming type flash photography).

) relates to an exposure control device suitable for 15 Conventionally, in the above-described light control type flash photography, it was necessary to manually set the aperture value unique to the flash device used on the camera side.

In addition, in such dimming type flash photography, when the flash device has multiple unique aperture values (hereinafter referred to as designated aperture values), the designated aperture value can be changed from one value to another. When changing the value to , the aperture aperture on the camera side must be manually set again, which is extremely troublesome to operate. The present invention has been made in view of the above-mentioned problems, and by attaching a 25-bright adjustable flash device to a camera, the aperture control mode of the camera is automatically switched from daylight to specified flash control. It is an attempt to solve the problem.

In particular, the present invention provides a light control amount control device 30 having the above-mentioned functions.
This corresponds to Example 6.

), the dimmer type flash device has a protrusion (corresponding to Embodiment 2) whose length is determined according to the designated aperture on the mounting foot for attaching the flash device to the flash device; One end (corresponding to 7-1 of the embodiment) protrudes into a groove provided in the part, and is normally positioned on the shoe part side by a spring, and when the dimming type flash device is attached to the shoe part, the protrusion is inserted into the shoe part. A detection lever (corresponding to Embodiment 7) that is pressed by a portion and moves by the length of the protrusion against the spring force, and a sliding contact piece (corresponding to Embodiment 7) fixed to the lever. (Equivalent to 2.)
(corresponds to R1 in the embodiment).
), a fixed contact piece (corresponding to S2-2 in the example) to which the light receiving element (corresponding to P in the example) is connected, and a fixed contact piece to which the sliding contact piece is connected (corresponding to P in the example) ) is normally connected to the fixed contact piece to which the light receiving element is connected, engages with the detection lever, and the sliding contact piece is connected by the displacement of the detection lever. a changeover switch (corresponding to S2 in the embodiment) having a movable contact piece (corresponding to S2-1 in the embodiment) that is switched and connected to the fixed contact piece; The present invention is extremely simple. The above-mentioned problem is solved by a mechanical mechanism. The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a camera system comprising a dimming type flash device having a designated aperture information signal member to which the present invention is applied, and a camera that uses the flash device in combination. 1 indicates a dimming type flash device that receives reflected light from the subject and automatically controls the amount of light emitted, but the length is determined according to the specified aperture on the mounting foot. A protrusion 2 is provided. 3 is the camera body, 4
1 is a viewfinder in the camera, M is an exposure meter, 5 is a saw tooth of a known EE mechanism that automatically adjusts the aperture of the camera by probing the pointer of the exposure meter M, and 6 is provided at the top of the camera case. The mounting shoes 1 and 7 of the dimming type flash device 1 shown in FIG.

S2 is a switching switch, and its movable contact piece S2-
1 engages with a pin implanted at the tip of the detection lever 7. R1 is a variable resistor formed between the sliding pieces 7 and 2 fixed on the lever 7, P is a light receiving element that receives the subject light after passing through the photographic lens by an optical system (not shown), and T
is an aperture, E is a power source, and S1 is a power switch. In the illustrated state, in the circuit of the camera 3, the main switch S1 is turned on and the contacts S2-1 and S2-2 of the changeover switch S2 are in contact, so the power supply E and the shutter speed information are input. A light-receiving element P, which is set at 4, is connected in series with a meter M, whose case is set to rotate according to film sensitivity information, and the aperture value at which proper exposure should be obtained at that time is displayed in the viewfinder 4 by its pointer. There is.

The camera 3 is provided with a saw blade 5 and the like, and the aperture aperture is automatically controlled by a so-called EE mechanism. When the flash device 1 is attached to the camera shutter 6, the tip 7-1 of the relay lever 7 is pushed and displaced by the protrusion 2 forming the specified aperture signal source, and this causes the switch S2 to switch to the S2- 1 is switched to the S2-2 side, and instead of the light receiving element P, a variable resistor R1 whose value is set by a sliding brush J and a shaft Q attached to the lever 7 is connected.

Therefore, if the specified aperture of the attached flash device 1 is, for example, ASAl
If F4 is detected in OO, the value of R1 becomes a corresponding value, a corresponding current flows through the meter M, and the pointer automatically indicates F4. If the sensitivity of the film you are using is ASA2OO, the case of Meter M is set to rotate for natural light photography, so it will automatically indicate F5.6. Also, if the flash device to be installed is F5.6 in ASAlOO, the length of the protrusion 2 is longer than the above-mentioned one, and the variable resistor R1 as the signal forming means for forming the specified aperture value signal is The value is set small and the pointer automatically moves to F5.
Since the aperture value is F5.6, the aperture value is F5.6.

As configured as described above, the present invention can automatically control the specified aperture of the camera from daylight to flash by simply adding an extremely simple mechanism to a camera with a conventional EE mechanism. This feature has great effects in dimmable flash photography.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a flash device and an exposure determining mechanism of a camera to which the present invention is applied. In the figure, 2: a protrusion of the flash device forming a designated aperture signal source; R1: a variable resistor R1 serving as a signal forming means;

Claims (1)

[Claims] 1. A dimming type flash device having a protrusion whose length is determined according to the specified aperture on the mounting foot for attaching the flash device to the shoe portion of the camera, and one end attached to the groove provided in the shoe portion. is protruded by a spring, and is normally located on the shoe part side, and when the dimming type flash device is attached to the shoe part, it is pressed by the protrusion part and moves by the length of the protrusion part against the spring force. A detection lever, a variable resistor that is slid by a sliding contact piece fixed to the lever, a fixed contact piece to which the light receiving element is connected, a fixed contact piece to which the sliding contact piece is connected, and a fixed contact piece to which the sliding contact piece is connected. a movable contact that connects to the fixed contact to which the light receiving element is connected, engages with the detection lever, and switches and connects the sliding contact to the fixed contact to which the sliding contact is connected by the displacement of the detection lever; and an EE connected to the movable contact piece and switch-connected to the light receiving element or the resistor through the movable contact piece to adjust the aperture aperture according to the light receiving element output or the resistor output.
1. An exposure control device comprising: a camera having a mechanism; and switching between daylight and flash photography.