JPH0128498Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a camera with a built-in strobe that integrates a photographic camera and a strobe device that is an artificial light source. The present invention relates to a camera with a built-in strobe equipped with a capacitor short-circuit type function to prevent erroneous light emission, and in particular to its switch configuration means.

2. Description of the Related Art Cameras with a built-in strobe, for example, which use the power supply of a strobe device as a power supply for a photometry circuit of the camera, are well known.

FIG. 1 is an electric circuit diagram showing an example of this, and shows a first power switch 1 consisting of a movable first contact piece 1a and first and second contacts 1b, 1c, and a movable second power switch 1. By controlling the energy supply of the power source 3 to the strobe device 4 or the photometry circuit 5 by the second power switch 2 consisting of the contact piece 2a and the third contact point 2b, the power source 3 can be shared. There is. In the figure, 6 indicates a DC-DC converter circuit 7 as a main capacitor, 8 a trigger circuit including a synchro switch 9, and 10 a flash discharge tube, which of course constitute the strobe device 4. do not have.

Further, the first power switch 1 is in a state in which the power supply 3 is not supplied to the DC-DC converter circuit 6 of the strobe device 4, that is, the first contact piece 1a is connected to the second contact point 1c.
As is clear from the drawing, in the so-called OFF state in which the trigger circuit 8 is in contact with It is possible to prevent erroneous flashing after the camera is turned off.

By the way, when actually manufacturing an electric circuit like the one shown in Figure 1 as a camera with a built-in strobe, each electric component can be installed on a printed circuit board, but three
The two switches must be constructed in such a way that they can be controlled by manual operation or shutter operation, and the structure between each switch must be designed with chronological considerations in consideration of the timing of operation or insulation, etc. Various considerations are required.

For this reason, in conventional devices, each switch was formed electrically and structurally independent from each other in order to extremely easily realize the above consideration.

Therefore, when actually manufacturing the device,
Each switch requires movable contact pieces, contacts, lead wires, etc., and has practical problems such as an increase in the number of work steps required to form the switch, and the size, location, and cost of forming the switch. was.

The present invention was developed to solve the above-mentioned problems, and the electric circuit is designed so that one component of each of the above switches can be used as a common potential part, that is, one metal component in a camera with a built-in strobe can be used instead. This configuration simplifies the configuration of each switch and provides an extremely practical switch in terms of the number of parts, work processes, space, cost, etc. This will be explained below with reference to the drawings.

FIG. 2 shows an electrical circuit diagram of a camera with a built-in strobe having a switch configuration means according to the present invention. In the figure, elements and parts having the same reference numerals as in FIG. 1 perform the same functions.

As is clear from FIG. 2, the switch configuration means according to the present invention has the same constituent elements and parts shown as an electric circuit diagram as the conventional device shown in FIG.
The relationship between the contact pieces or contacts between the first power switch 1 and the second power switch 2 is changed.

That is, in the conventional device, the common potential portion between the first power switch 1 and the second power switch 2 corresponds to the operating state of the first switch 1, that is, the position of the first contact piece 1a. However, in the case of the switch configuration means according to the present invention, in order to prevent the above-mentioned large change from occurring, there is a first switch between the first power switch 1 and the second power switch 2. A common potential portion is formed that is not affected by the operating state of the power switch 1.

When the switch means according to the present invention is actually assembled as a device according to such an electric circuit, for example, the third
It becomes possible to have a structure as shown in the figure.

In FIG. 3, 11 is a well-known shutter base plate made of metal that is an electrical conductor, and 12 is attached to the shutter base plate 11 and moves the shutter in conjunction with the operation of a shutter release button (not shown). A shutter release lever 13 is provided insulated from the shutter base plate 11 and forms the second power switch 2 together with the lever 12, and a well-known shutter release lever 14 is electrically connected to the shutter base plate 11. The shutter blade 15 is insulated and protrudes from the shutter base plate 11 and serves as a contact point that forms the synchro switch 9 together with the shutter blade 14. The protruding pin 16 is connected to a drive source (not shown) and serves as a light emitting part of the strobe device. The control levers 17 and 18 provided on the shutter base plate 11 for moving the shutter base plate 17 respectively represent contacts that are insulated from the shutter base plate 11 and form the first power switch 1 together with the control lever 16.

As is clear from FIG. 3, the common potential portion of the circuit shown in FIG. 2 is constructed using a well-known shutter base plate 11.

For this reason, the configuration of each switch mentioned above makes it possible to use levers, control levers, etc. that did not previously function as direct electrical components in cameras with built-in strobes as one contact point of the switch. Therefore, it is possible to directly utilize a member that is desired to be interlocked with the control structure of the switch, such as a shutter release lever, without using any intermediate member, thereby making it possible to reduce the number of members constituting the switch.

This is because, in the conventional device having the electric circuit shown in FIG. 1, if each switch is to be constructed on the shutter base plate 11, a contact piece that operates in conjunction with the member to be interlocked is required. Needless to say, this contact piece is an extra component with respect to the present invention described above.

In addition, in the conventional device, the insulation of the contact piece between it and the shutter base plate 11 is not affected by the operation of the switch, so each switch must be made independent, so careful attention must be paid to each switch. In addition, it is clear that there will be a large number of insulation treatment locations even if you simply think about it.

On the other hand, in the switch configuration means according to the present invention, the common potential part is the shutter base plate, and the insulating parts are the contact piece 13, the protruding pin 15, the contact pieces 17 and 18 in the embodiment shown in FIG. The number of insulation treatment parts is small, and there is no need to perform insulation treatment on moving parts such as the shutter release lever 12, shutter blade 14, etc., and the overall configuration is extremely simple. becomes possible.

As described above, the present invention is characterized in that a common potential portion is provided in the electric circuit which is not affected by the operation of multiple switches such as a power switch for a photometer circuit, a power switch for a strobe device, etc. The present invention provides a means for configuring a switch for a camera with a built-in strobe, which is characterized by using a shutter base plate as a shutter base plate, and can improve various problems such as cost, space, and number of manufacturing steps that conventional devices had due to the number of parts. It has extremely high practical value.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a camera with a built-in strobe having a conventional photometry circuit, Fig. 2 is an electric circuit diagram of a camera with a built-in strobe and a photometry circuit according to an embodiment of the present invention, and Fig. 3 is an electric circuit diagram of a camera with a built-in strobe according to the present invention. FIG. 3 is a configuration diagram of an example of a mechanism of a switch configuration means. DESCRIPTION OF SYMBOLS 1...First power switch, 2...Second power switch, 3...Power source, 4...Strobe device, 5
...Photometering circuit, 6...DC-DC converter circuit,
7... Main capacitor, 8... Trigger circuit, 10
... Flash discharge tube, 11 ... Shutter base plate, 14
...Shutter blade.

Claims (1)

[Scope of claims for utility model registration] (1) A photographic camera equipped with a photometric circuit and a DC-DC
A camera with a built-in strobe that integrates a strobe device consisting of a converter circuit, a main capacitor, a flash discharge tube, etc., and shares a low-voltage power supply with the photometry circuit and the flash discharge tube, wherein one end of the power supply, the main capacitor, and the flash discharge tube are connected together. A movable first contact piece connected to a connection point with a pipe, and connected to the DC-DC converter circuit and in contact with the first contact piece to connect the power source to the DC-DC converter circuit. The first supplying the circuit
and a second contact connected to the trigger circuit of the flash discharge tube and short-circuiting the trigger circuit by contacting the first contact; a second contact piece that is movable and connected to a connection point with the contact piece; a third contact piece that is connected to one end of the photometric circuit and supplies the power to the photometric circuit by contacting the second contact piece; a second power switch consisting of a contact, and a common potential portion unrelated to the operation of the first power switch is configured between the second power switch and a main capacitor. Built-in camera. (2) Connect one end of the power supply to which one end of the first and second contacts, the main capacitor, and one end of the flash discharge tube are connected to the metal shutter base plate on which the shutter mechanism is installed, and use this shutter base plate to A camera with a built-in strobe according to claim 1, characterized in that a common potential portion is formed by a strobe.