JPH02293834A - Camera switch - Google Patents

Abstract

PURPOSE:To give the degree of freedom to the layout of a contact and its structure by permitting a switch actuation member to use a conductive terminal which electrically energizes both terminals of a camera main body and accessory. CONSTITUTION:The GND contact 21 of the accessory 3 is provided in a position which corresponds with a switch actuation pin 7c; when the accessory 3 is attached in the prescribed position of the camera main body 1, the GND contact 21 pushes the switch actuation pin 7c to open a switch circuit similarly to when a single grip is attached; then, the GND of the accessory 3 is brought into contact with the GND of the camera main body 1 by abutting of the GND contact 21 on the another penetrating terminal 7f of the switch actuation pin 7c. That is, a reset switch 7 functions as the original reset switch and the GND contact of the accessory for signal communication. Thus, the need to attach an additional, dedicated terminal to the camera main body is eliminated, and the degree of freedom is given to the layout of other contacts and its structure.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention... The contact mechanism that supplies power or sends/receives signals between the camera body and attached devices such as motor drives that are removably attached to the camera body is turned on and off when attached devices are attached to the camera body. This relates to a camera switch that doubles as a switch.

(Prior Art) In recent years, the components of cameras have shifted from mechanical parts to electrical parts, and with this, many accessory devices that are removably attached to the camera body also include electrical elements. 《
As a result, the number of electrical contacts for power supply and signal exchange between the camera body and attached devices is increasing.

(Problems to be Solved by the Invention) By the way, the most important thing in electrical contacts is reliability. In other words, it is necessary to have a structure or layout that takes into account dew condensation, dust prevention, etc., as well as improvements to the contacts themselves such as multipolarization.

However, when it comes to where to place the contacts, there is not a lot of flexibility due to factors such as how to attach attached devices and the miniaturization of cameras, so it is necessary to reduce the number of contacts as much as possible.
It is required to provide sufficient margin for the arrangement of contacts and the structure around the contacts.

An object of the present invention is that when attached equipment such as a motor drive is attached to the camera body, the circuits of the camera body are turned on. The switch installed on the camera body that outputs the off signal also functions as a contact point that supplies power and sends/receives signals between the camera body and attached devices, allowing flexibility in the layout and structure of the contacts. This provides a switch for the camera. [Means for Solving the Problems] The gist of the present invention is to provide a method in which the terminal of the accessory device comes into contact with the switch actuating member as the accessory device is attached to the camera body. A switch for a camera that performs switching by moving a switch contact piece provided on the camera body, the switch operating member also serving as a conductive terminal for electrically connecting the camera body side and the terminal of the attached device. There is a switch on the camera that is characterized by this.

(Function) When the accessory device is attached to the camera body, the camera switch configured as described above performs a predetermined switch operation and electrically connects the contact point of the accessory device to the camera body side.

(Embodiment) Figure 3 is an external perspective view of a camera that can effectively implement the present invention. FIG. 3 shows a state in which the grip portion is removed from the grip attachment portion A of the camera body 1, and the grip portion shown in FIG. 4 is attached to this grip attachment portion A. Lithium electrons (2C
R5 type) is housed in a single grip 2. Alternatively, an accessory 3 such as a motor drive as shown in FIG. 6 is attached. 4 is a protrusion that serves as a support member for positioning the single grip 2 or the accessory 3 when it is attached to the camera body 1 and for preventing wobbling when attached. 5 is a screw for fixing the single grip 2 to the camera body 1, 6 is a contact block for power supply or signal communication between the single grip 2 and accessories 3, and 7 is a control inside the camera body. This is a reset switch for resetting the circuit IC, and when accessory 3 is installed, it also serves as a GND line for signals. 8 is a tripod screw, which is also the fixing screw for accessory 3. 9 is a driven side coupler for mechanically coupling the accessory 3 with the camera body 1; 10 is a hole for positioning the accessory 3 with the camera body 1; The single grip 2 shown in FIG. 4 has a hole l1 that fits into the protrusion 4 and maintains a securely attached state. This hole 11 is provided in the accessory 3 shown in FIG. 6 in exactly the same way. 12 is a fixing screw numbered 5 and 5, which is fixed to the camera body 1 by tightening it with a coin or the like. 13.14 is the ■pole of a package type lithium battery. These are battery contacts that respectively contact the θ poles, and are internally connected to contacts 15 and 16, respectively. These contacts 15 and 16 are the contact block 6 on the camera side.
When it comes into contact with the corresponding contact, power is supplied to the camera body. Figure 5 shows the lithium battery inserted. To remove the battery, place your finger on the top of the lithium battery at the notch 17 for finger relief and pull it out in the direction of the arrow. ．． FIG. 6 is a perspective view of the accessory 3. Unlike the single grip 2, the power source is built in eight AA batteries (not shown). To insert and remove batteries, use battery 12.
This is done by opening and closing 6. Built-in battery Φ pole,
The e poles are internally connected to contacts 18 and 19, respectively,
Power is supplied to the camera through this contact 18,19.

20 is a group of contacts for signal communication performed with the camera body 1, and 21 is a ground (GND) contact for signal communication. To fix the accessory 3 to the camera body l, the screw 23 is attached to the tripod screw 8 by turning the tightening ring 22. 24 is a driving coupler connected to the driven coupler, and 25 is a positioning pin inserted into the positioning hole 10.

As shown in FIGS. 1 and 2, the reset switch 7 has a reset signal contact piece 7b fixed to an insulating reset switch seat 7d, and a conductive reset ground (such as a plate spring) having spring properties. GN D) The contact piece 7a is provided opposite the reset signal contact piece 7b, and the reset GND contact piece 7a is always in contact with the reset signal contact piece 7b due to its spring property to constitute a normally closed switch circuit. A conductive switch operating pin 7C is axially movably passed through the reset switch seat 7d, and a flange portion 7e formed at one end of the switch operating pin 7C is brought into contact with the free end of the reset GND contact piece 7a. The switch activation pin 7C is connected to the reset GND contact 7 when the above-mentioned switch circuit is in a closed state.
a, the other end 7f protrudes outward from the exterior cover 1a of the camera body 1, and the reset GND
It is always electrically connected to the contact piece 7a and connected to the GND side of the camera body 1 side.

In such a configuration, when the single grip 2 is attached to a predetermined position on the camera body as described above, the other penetrating end 7f of the switch operating pin 7c protrudes outward beyond the exterior cover 1a, as shown in FIG. Because of this, the penetration and other 0%
47f comes into contact with the inner bottom surface 2a of the single grip 2, and the switch operating pin 7c moves to the inside of the camera body 1 against the spring force of the reset GND contact piece 7a, and the reset GND contact piece 7a and the reset signal contact piece 7b is opened, and a reset signal is manually applied from the reset signal contact piece 7b to the control circuit IC provided in the camera body.

On the other hand, the GND contact 21 of accessory 3 is connected to the switch operating pin 7.
As shown in FIG. 1, when the camera body 1 is mounted at a predetermined position, the GND contact 21 pushes the switch actuating pin 7C and the switch is installed at a position corresponding to the single grip described above. Similarly, the switch circuit is opened, and the GND contact 21 is connected to the other end 7f through which the switch operating pin 7c passes.
By making contact with the GND side of the accessory 3, the GND side of the accessory 3 is connected to the GND side of the camera body 3. That is, the reset switch 7 has a function as a glue set switch and a GND contact for signal communication of accessories.

Although the above embodiment has been explained using the reset switch of the control circuit IC of the camera body as an example, the present invention is not limited to this, and the present invention may be used to output a switch signal to other circuits, etc. It may be used for signal communication with circuits, etc.
Furthermore, the switch circuit may be of a normally open type.

Further, in the above embodiment, the switch actuation pin 7c is made to protrude outward from the camera body, but it is positioned inside the outer surface of the camera body, and the GND terminal 21 of the accessory 3 is made protruding. When installing product 3, the protruding GND terminal 21
The same effect can be obtained by pressing the switch activation bottle at
In this case, it is possible to prevent the user from accidentally pressing the switch actuation pin with the accessory 3 removed.

〔Effect of the invention〕

As explained above, according to the present invention, the switch actuating member has the function of a terminal that contacts the terminal of the attached J7IE device, so that it can supply power and exchange signals between the attached device and the camera body. As a result, there is no need to provide a separate dedicated terminal on the camera body, allowing flexibility in the layout and structure of other contacts, resulting in highly reliable contacts. Now available.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing one embodiment of a camera switch according to the present invention, FIG. 3 is a perspective view of a camera that can effectively implement the present invention, and FIGS. 4 and 5 are FIG. 6 is a perspective view of the single grip, and FIG. 6 is a perspective view of the accessory (motor drive). 1...Camera body 2...Single grip 3.
...Accessories (motor drive) 6...Contact block 20...Contact group for signal communication 21...GND contact for signal communication. Figure l Figure Figure Figure Figure

Claims (1)

[Scope of Claims] 1. A camera switch in which, as an accessory device is attached to a camera body, a terminal of the accessory device comes into contact with a switch actuating member and moves a switch contact piece provided on the camera body to perform a switching operation. A camera switch 2, characterized in that the switch actuating member also serves as a conductive terminal that electrically connects the camera body side and the terminal of the accessory device. The camera switch according to claim 1, wherein the camera switch is electrically connected to the switch.