JPH0538334Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Purpose of the invention] (Field of industrial application) The present invention relates to a camera with a built-in strobe having an automatic aperture mechanism. (Prior technology) Conventional cameras with built-in strobes, for example,
- The one described in Publication No. 192627 is known. In the device described in Japanese Utility Model Application No. 58-192627, the shutter speed is kept constant, the aperture diameter is changed according to the sensitivity of the film and the shooting conditions, and the aperture diameter is linked to the operation of the aperture ring that changes the aperture diameter. The flash is automatically set under shooting conditions such as indoors or on cloudy days. In addition, in order to keep the price of the camera low, such simple cameras do not have a full-fledged automatic exposure control device built-in, and the aperture diameter must be manually selected depending on the sensitivity of the film, the weather, and whether or not a strobe is used. I try to do that. However, in the camera with a built-in strobe described in Japanese Utility Model Application No. 58-192627, the aperture diameter is manually changed using a cam mechanism or the like, which makes the aperture mechanism complicated and the operation complicated. Furthermore, for example, a camera described in Japanese Utility Model Application Publication No. 112323/1983 is also known. The camera described in this Utility Model Publication No. 61-112323 is
A camera is described that controls exposure according to film sensitivity and whether or not a strobe is used. A light amount adjusting member having a plurality of large diameter apertures and a plurality of small diameter apertures is disposed on the front side of the light receiving element of the camera body, and this light amount adjusting member is adjusted to adjust the amount of light received by the light receiving element,
It is adjusted according to the film sensitivity and whether or not a strobe is used. However, the camera described in Japanese Utility Model Application No. 61-112323 has a light-receiving element, and the aperture is controlled depending on the amount of light received by the light-receiving element, so the configuration is complicated. Become. (Problems to be solved by the invention) As mentioned above, the camera with a built-in strobe described in Japanese Utility Model Application Publication No. 58-192627 manually changes the diameter of the aperture hole using a cam mechanism, etc., and the aperture mechanism is complicated. In addition, there is a problem that the operation becomes complicated. Furthermore, the camera described in Japanese Utility Model Application Publication No. 61-112323 has a light-receiving element, and the aperture is controlled depending on the difference in the amount of light received by the light-receiving element, which results in a complicated configuration. I have a problem. The present invention was devised in view of the above-mentioned problems, and it is an object of the present invention to provide a camera with a built-in strobe in which automatic aperture is performed by a simple mechanism. [Structure of the invention] (Means for solving the problems) A camera with a built-in strobe according to the invention has a fixed aperture plate having an aperture hole, and an aperture hole having a smaller diameter than the aperture hole of the fixed aperture plate. a first movable diaphragm plate whose diaphragm hole can overlap with the diaphragm hole of the diaphragm plate; and a diaphragm hole having a smaller diameter than the aperture hole of the first movable diaphragm plate, and which corresponds to the aperture hole of the fixed aperture plate. a second movable diaphragm plate capable of overlapping the diaphragm hole, a strobe switch that operates based on whether the strobe is used or not, and a strobe switch that detects the sensitivity of the film to be filled and adjusts the sensitivity to low or high according to the detected film sensitivity. a film sensitivity changeover switch for switching, a control means for controlling based on the settings of the strobe switch and the film sensitivity changeover switch, and a control means for controlling the first movable aperture plate and the second movable aperture plate according to the settings of the fixed aperture plate. a first driving means for overlapping and separating the second movable aperture plate from the fixed aperture plate according to the strobe switch;
When the strobe switch is set to use a strobe and the film sensitivity selector switch is set to low sensitivity, the first movable aperture plate is separated from the fixed aperture plate by the first driving means. using the aperture diameter of the aperture hole of the fixed aperture plate to set strobe use with the strobe switch;
Further, when the film sensitivity selector switch is set to high sensitivity, the first movable aperture plate is superimposed on the fixed aperture plate by the first driving means, and the aperture of the first movable aperture plate is adjusted. The pore diameter is used. (Function) This invention detects and automatically sets the sensitivity of the loaded film using the film sensitivity switch, and when shooting, the strobe switch is set to use a strobe, and the film sensitivity switch is set to low sensitivity. is set, the first drive means is controlled by the control means to separate the first movable aperture plate from the fixed aperture plate and use the diameter of the aperture hole in the fixed aperture plate to use the strobe with the strobe switch. is set and the film sensitivity selector switch is set to high sensitivity, the control means drives the first driving means to overlap the first movable aperture plate with the fixed aperture plate, and Using the hole diameter of the aperture hole of the movable aperture plate, the second movable aperture plate is superimposed from the aperture plate according to the strobe switch by the second driving means,
The diameter of the aperture hole in the second movable aperture plate or the diameter of the aperture hole in the movable aperture plate is used to select the aperture hole in accordance with the sensitivity setting of the film and the use condition of the flash. (Embodiment) Hereinafter, an embodiment of the camera with a built-in strobe of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a fixed aperture plate, and a circular aperture hole 2 corresponding to the maximum aperture, for example, an aperture value F4, is formed in the center of the fixed aperture plate 1. A first movable aperture plate 4 and a second movable aperture plate 5 are rotatably mounted on one surface of the fixed aperture plate 1 by a support shaft 3 at one end thereof. This first movable aperture plate 4 is formed with a circular aperture hole 6 corresponding to an aperture value F8 smaller than the aperture hole 2 for an aperture value F4 of the fixed aperture plate 1, and
The second movable aperture plate 5 has an aperture value F16 which is smaller than the aperture hole 6 for the aperture value F8 of the first movable aperture plate 4.
A circular aperture hole 7 corresponding to the aperture is formed, and the centers of the circles of each of these aperture holes 2, 6, and 7 are provided at the same distance from the center of the support shaft 3. Locking portions 8 and 9 are provided on the tip sides of the first movable aperture plate 4 and the second movable aperture plate 5, and the locking portions 8 and 9 protrude from the fixed aperture plate 1. The first movable aperture plate 4 and the second movable aperture plate 5 are positioned by abutting on the fixed aperture plate 10, and their aperture holes 6, 7 are positioned within the aperture hole 2 of the fixed aperture plate 1. Further, the first movable aperture plate 4 is moved clockwise around the support shaft 3, and the second movable aperture plate 5 is moved counterclockwise around the support shaft 3 by means of a spring 11 provided on the support shaft 3. energized. Also, the first
An operating part 12 is located at the upper part of the movable diaphragm plate 4 near the shaft support.
is formed, and the second movable aperture plate 5
Two actuating parts 13 and 14 are formed at the upper part near the shaft support. Reference numeral 21 denotes a first drive device, and in this first drive device 21, a lever 23 is rotatably supported by a support shaft 22 at an intermediate portion thereof, and a first movable device is attached to one end of this lever 23. A pin-shaped actuating body 24 is attached to the actuating parts 13 and 14 of the aperture plate 4 and the second movable aperture plate 5, and the lever 23 is biased clockwise by a spring 25, and the lever 23 is biased clockwise by a spring 25. 26, it is stopped at a predetermined position. Also, an iron piece 27 is attached to the other end of the lever 23.
An electromagnetic coil 28 is provided opposite the iron piece 27, and the iron piece 27 and the electromagnetic coil 28 constitute an electromagnetic drive mechanism. Note that the spring 25 of the lever 23 is set to have a larger operating force than the spring 11. Furthermore, 31 is a second drive device, and this second drive device 31 has a lever 33 rotatably supported by a support shaft 32 at an intermediate portion thereof.
A pin-shaped actuating piece 34 that engages and disengages from the actuating portion 14 of the second movable aperture plate 5 is attached to one end, and
The lever 33 is biased clockwise by a spring 35. Further, an engagement pin 36 is provided on the other end side of the lever 33, and this engagement pin 36 is engaged with a long hole 38 of a support member 37 of a strobe light emitting tube frame (not shown) that is biased upward. . Further, a normally open strobe power switch 41 is provided at the top of the lever 33, with a movable contact 40 disposed below the fixed contact 39, and a movable contact above the fixed contact 42 is provided at the bottom of the lever 33. Always open type strobe off switch 4 with 43 installed
4 are provided. When the support member 37 of the strobe light emitting tube frame rises and the lever 33 rotates counterclockwise, the other end of the lever 33 presses the movable contact 40 of the strobe power switch 41 upward, and the fixed contact 39 of the strobe power switch 41 is pressed upward. When the support member 27 of the strobe light emitting tube frame descends and the lever 33 rotates clockwise,
The other end of the lever 33 presses down a movable contact 43 of a strobe off switch 44 as a strobe switch, and also contacts a fixed contact 42 to turn it on. Although the shutter is not shown, for example, 1/125
is set to a constant speed. FIG. 3 shows a circuit diagram serving as a control means for the first drive device 21, in which there is a shutter switch 53 between power terminals 51 and 52 that supplies power in conjunction with the shutter release, an electromagnetic coil 28, and a resistor between the base and emitter. The collector and emitter of an NPN transistor 55 having 54 are connected in series. Further, the connection point between the shutter switch 53 and the electromagnetic coil 28 is connected to the emitter-collector of a PNP type transistor 57 having a resistor 56 between the base and emitter, and to the base of a transistor 55 via a resistor 58. Connected from the base of the transistor 57 in parallel via a resistor 59 are a strobe off switch 44 that is turned on when the strobe is off, and a film sensitivity selector switch 60, commonly known as a DX code, which is encoded on the outer periphery of the film cartridge. A film sensitivity changeover switch 60, which is activated by detecting film sensitivity information, is connected to the base and emitter of the transistor 55, respectively. And film sensitivity selector switch 60
For example, is off when ASA100, and on when ASA400. Then, the aperture is determined as shown in Table 1 depending on whether or not a strobe is used and the type of film sensitivity, such as ISO sensitivity ASA100 and ASA400.

[Table] In this case, when the subject brightness is the same, the aperture diameter is selected in opposition to the change in film sensitivity, so when the ISO sensitivity is ASA100 and the aperture value is F4,
When using ASA400 and aperture value F8, the exposure will be the same. Next, the operation of the above embodiment will be explained. First, when using a strobe with an ISO sensitivity of ASA100, the support member 37 of the strobe rises from the state shown in FIG.
Then, the lever 33 is rotated via the engagement pin 36 in a counterclockwise direction opposite to the direction in which the spring 35 is biased. Then, the lever 33 presses the movable contact 40 of the strobe power switch 41 to turn on the strobe power switch 41, and the actuating piece 34 of the lever 33 contacts and presses the actuating part 14 of the second movable aperture plate 5. Then, the second movable aperture plate 5 is rotated clockwise against the force of the spring 11 to adjust the aperture value.
From the optical path of the aperture hole 2 for F4 to the second movable aperture plate 5
remove. At the same time, the lever 33 separates from the movable contact 43 of the strobe off switch 44, so that the strobe off switch 44 is turned off. and,
When the shutter switch 53 in FIG. 3 is turned on,
While the strobe off switch 44 is off,
The ISO sensitivity is ASA100 and the film sensitivity selector switch 60 is off, so the transistor 57
The base current of the transistor 57 does not flow, and the transistor 57 is off, and the base current of the transistor 55 also does not flow, so the transistor 55 also remains off. Even when the shutter switch 53 is turned on, the electromagnetic coil 28 is not energized and the iron piece 27 is not attracted, so the lever 23 is biased clockwise by the spring 25 and the actuating part 12 of the first movable diaphragm plate 4 is biased clockwise. The first movable aperture plate 4 is rotated counterclockwise to remove it from the optical path of the aperture hole 2 for aperture value 4. Therefore, only the aperture hole 2 for the aperture value F4 exists in the optical path, and the aperture value becomes F4, that is, the state shown in FIG. . Next, when the ISO sensitivity is ASA100 and the strobe is not used, when the strobe is lowered and its support member 37 is lowered, the lever 33 is rotated clockwise and the movable contact 4 of the strobe power switch 41 is
0, the strobe power switch 41 is turned off, and conversely, the lever 33 presses the movable contact 43 of the strobe off switch 44 to turn on the strobe off switch 44. When the shutter switch 53 of the circuit shown in FIG. 3 is turned on, the film sensitivity changeover switch 60 is turned off because it is ASA100, but since the strobe off switch 44 is turned on, the base current of the transistor 57 flows and the transistor 57 is turned on. , the base current of the transistor 55 flows and the transistor 55 is turned on,
The electromagnetic coil 28 is energized, the electromagnetic coil 28 attracts the iron piece 27, and the lever 23 rotates in a clockwise direction opposite to the direction in which the spring 25 is biased. The actuating body 24 then moves the second movable aperture plate 5
The second movable aperture plate 5 is rotated clockwise to be removed from the optical path, and the first movable aperture plate 4 is moved to the second movable aperture plate 5 by the biasing force of the spring 11. The locking portion 8
contacts the pin 10 of the fixed aperture plate 1. As a result, the aperture hole 6 for the aperture value F8 of the first movable aperture plate 4 is located within the optical path of the aperture hole 2 for the aperture value F4 of the fixed aperture plate 1, and the aperture hole 6 for the aperture value F8 allows
Shoot with the aperture value set to F8. Next, when the ISO sensitivity is ASA400 and a strobe is used, the strobe support member 37 rises and the lever 3
3 in the clockwise direction opposite to the biasing direction by the spring 35, and presses the movable contact 40 of the strobe power switch 41 with the lever 33 to turn on the strobe power switch 41, and the actuating piece 34 of the lever 33 turns on. The second movable aperture plate 5 is rotated clockwise against the force of the spring 11 by pressing the operating part 14 of the second movable aperture plate 5, and the second movable aperture plate 5 is moved from the aperture hole 2 for the aperture value F4 to the second movable aperture plate. Remove plate 5. Also,
The strobe is raised and the lever 33 is separated from the movable contact 43 of the strobe off switch 44, so that the strobe off switch 44 is turned off. When the shutter switch 53 is turned on and power is supplied, the strobe off switch 44 is turned off.
Since the ISO sensitivity is ASA400, the film sensitivity selector switch 60 is on, so the base current of the transistor 57 flows and
At the same time, a base current flows through the transistor 55 to turn on the transistor 55, thereby energizing the electromagnetic coil 28, attracting the iron piece 27, and rotating the lever 23 counterclockwise. Therefore, the first
The actuating part 12 of the movable aperture plate 4 moves according to the actuating body 24 of the lever 23 due to the biasing force of the spring 11, and the locking part 8 of the first movable aperture plate 4 comes into contact with the pin 10 of the fixed aperture plate 1. , aperture hole 6 for aperture value F8
enters the optical path of aperture hole 2 for aperture value F4.
The aperture value is F8 due to the aperture hole 6 for F8. Also,
The strobe flashes in conjunction with the shutter switch 53. Furthermore, when the ISO sensitivity is ASA400 and the strobe is not used, the strobe support member 37 is lowered, the lever 33 is also rotated clockwise, and the lever 33 is separated from the movable contact 40, so that the strobe power switch 4
1 is turned off, and conversely, the lever 33 presses the movable contact 43 of the strobe off switch 44 to turn on the strobe off switch 44. When the shutter switch 53 is turned on, the film sensitivity changeover switch 60 is turned on for ASA400, and the strobe off switch 44 is also turned on. Therefore, the base current of the transistor 57 flows between the emitter and collector of the transistor 57 and the resistor 58.
A current flows to turn on the transistor 55, but since both the film sensitivity selector switch 60 and the strobe off switch 44 are on, the current is bypassed into this loop and the transistor 55 is turned on.
No base current is supplied to transistor 5, and transistor 5
5 is turned off, and the electromagnetic coil 28 is not energized. Therefore, since the iron piece 27 is not attracted, the lever 23 is biased clockwise by the spring 25, and the actuating body 24 abuts against and presses the actuating portion 12 of the first movable aperture plate 4. is removed from the optical path of aperture hole 2 for aperture value F4. Accordingly, the second movable aperture plate 5 is pulled by the spring 11, the locking part 9 comes into contact with the pin 10, and the aperture hole 7 for the aperture value F16 enters the optical path of the aperture hole 2 for the aperture value F4, so that the aperture value F16 The aperture value is F16 due to the aperture hole 7. According to the above embodiment, the first movable aperture plate 4 and the second movable aperture plate 5 are driven by the drive devices 21 and 31 in response to signals from the lever 33, strobe off switch 44, and film sensitivity changeover switch 60, so the mechanism is simple. The aperture can be set automatically, simplifying the mechanism of a camera with a built-in strobe. Further, as another embodiment, the logic circuit shown in FIG. 4 may be used instead of the transistor circuit shown in FIG. 3. In this case, one input terminal of the exclusive OR circuit 7 is the A terminal, the other input terminal is the B terminal, and the output terminal is the C terminal. Film sensitivity selector switch 60 is connected to this A terminal.
Connect the strobe off switch 44 to the B terminal, and
An electromagnetic coil 28 is connected to the terminal, and this circuit operates as shown in Table 2, that is, C=.B+A.

[Effect of idea]

According to the camera with a built-in strobe of the present invention, when the strobe switch is set to use a strobe and the film sensitivity selector switch detects low sensitivity of the film and is set to low sensitivity, the first driving means The first movable diaphragm plate is separated from the fixed diaphragm plate, the strobe switch is set to use the strobe, and the film sensitivity selector switch detects the high sensitivity of the film and uses the diameter of the diaphragm hole in the fixed diaphragm plate. When the sensitivity is set, the first driving means overlaps the first movable diaphragm plate with the fixed diaphragm plate and uses the diameter of the aperture hole of the first movable diaphragm plate, and the second driving means The second movable diaphragm plate is overlapped and separated from the fixed diaphragm plate according to the strobe switch, and the setting state of the sensitivity of the film is determined by using the diameter of the aperture hole of the second movable diaphragm plate or the diameter of the aperture hole of the movable diaphragm plate. Since the aperture hole is selected according to the usage condition of the strobe, a predetermined aperture can be automatically obtained with a simple mechanism and simple operations, making it possible to simplify the mechanism of cameras with built-in strobes. can.

[Brief explanation of the drawing]

1 and 2 are front views of one embodiment of the camera with a built-in strobe according to the present invention, FIG. 3 is a circuit diagram showing the control means of the same, and FIG. 4 is a logic circuit diagram of the same. 1... Fixed aperture plate, 2, 6, 7... Aperture hole, 4
...first movable aperture plate, 5...second movable aperture plate, 21...first drive device as first drive means, 31...second drive device as second drive means , 44... Strobe off switch as a strobe switch, 60... Film sensitivity changeover switch.

Claims (1)

[Claims for Utility Model Registration] A fixed diaphragm plate having a diaphragm hole, and a diaphragm plate having a diameter smaller than that of the diaphragm hole in the fixed diaphragm plate, the aperture hole being superimposed on the aperture hole in the fixed diaphragm plate. a second movable diaphragm plate having a diaphragm hole having a smaller diameter than the diaphragm hole of the first movable diaphragm plate and capable of overlapping the diaphragm hole with the diaphragm hole of the fixed aperture plate; A strobe switch that operates based on whether the strobe is used or not; a film sensitivity changeover switch that detects the sensitivity of the loaded film and switches between low sensitivity and high sensitivity according to the detected film sensitivity; and the strobe switch and the film sensitivity changeover. a control means for controlling based on the settings of the switch; a first driving means for overlapping and separating the first movable aperture plate and the second movable aperture plate from the fixed aperture plate according to the control means; and the strobe switch. a second movable diaphragm plate that overlaps and separates from the fixed diaphragm plate according to the
and a driving means, when the strobe switch is set to use a strobe and the film sensitivity selector switch is set to low sensitivity, the first driving means drives the first movable diaphragm plate. When the strobe switch is set to use a strobe and the film sensitivity selector switch is set to high sensitivity, the diaphragm is separated from the fixed diaphragm plate and the diameter of the aperture hole of the fixed diaphragm plate is used. 1. A camera with a built-in strobe, characterized in that said first movable aperture plate is superimposed on said fixed aperture plate by said first driving means, and said aperture diameter of said aperture hole of said first movable aperture plate is used.