JP3700233B2 - Anti-vibration and oil-proof device for camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera incorporating a drive unit for film winding and rewinding mechanisms, and in particular, it prevents transmission to the camera body by absorbing vibration of the drive unit and protects switch contacts from scattered lubricant. The present invention relates to an anti-vibration and oil-proof device for a camera.
[0002]
[Prior art]
Various cameras that incorporate a drive motor and automatically perform film winding and rewinding by the driving force have been known. In such a camera, if the drive unit is fixed directly to the camera body, the vibrations of the motor and gear are transmitted to the camera body and cause noise, so the drive unit is attached to the board, and this board is attached to the camera body with a vibration isolating member. (Example: Japanese Patent Laid-Open No. 4-371932).
[0003]
[Problems to be solved by the invention]
However, the drive unit of the film winding / rewinding mechanism often applies oil (lubricating oil, grease) to reduce friction and prevent wear on the gear that transmits the rotation of the motor. If the switch for detecting the open / closed state is arranged close to the drive unit, there is a problem that oil scatters from the gear and adheres to the contact of the switch, so that the switch does not function normally.
[0004]
Therefore, in order to solve such a problem, it is only necessary to arrange a member that prevents the scattered oil from adhering to the switch between the drive unit and the switch. As a result, a new problem arises that the manufacturing cost increases.
[0005]
The present invention has been made to solve the above-described conventional problems, and the object of the present invention is to increase the number of parts and the number of assembling steps by providing a single member with a vibration-proof function and an oil-proof function. An object of the present invention is to provide an anti-vibration and oil-proof device for a camera that can be manufactured at low cost.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a board is mounted in a camera body via a vibration isolating member, and a drive unit comprising a motor and a gear train for transmitting the driving force of the motor is placed close to the board. The anti-vibration member is formed so as to partition a space between the drive unit and the switch contact, and an end thereof is in close contact with an inner wall surface of the camera body. .
Further, the present invention is characterized in that both ends of the vibration isolating member are in close contact with the inner wall surface of the camera body, and the switch contact is surrounded by the camera body and the vibration isolating member.
[0007]
In the present invention, the vibration isolating member holds the substrate so that the vibration of the drive unit is not transmitted to the camera body through the substrate. In addition, the oil applied to the gear of the drive unit scatters and adheres to the switch contact by being formed to have a shape and structure that partitions the space between the drive unit and the switch contact. Stop. Further, when the switch contact is surrounded by the vibration isolating member and the camera body, oil and dust do not enter the enclosed space.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a cross-sectional view of a film winding and rewinding mechanism portion of a camera equipped with a vibration and oil proof device according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. It is. In these figures, 1 is a camera body, 2 is a substrate attached to the camera body 1 via a vibration isolator 3, 4 is a film winding and rewinding mechanism drive unit attached to the substrate 2, and 5 is the same. A switch for detecting the open / closed state of a back cover (not shown) attached to the substrate 2, 6 is a top plate for covering the opening of the camera body 1, and 7 is a stop for fixing the substrate 2 to the camera body 1 via the vibration isolating member 3. It is a screw. In FIG. 1, the top plate 6 is omitted.
[0009]
The anti-vibration member 3 is formed long so as to partition the drive unit 4 and the switch 5 with an elastic material such as rubber and is detachably attached to one end portion of the substrate 2. The anti-vibration member 3 is attached to the substrate 2 by attaching the fixing portions 3A provided at both ends of the anti-vibration member 3 to the fitting recesses 11 provided at both corners on the switch side of the substrate 2, respectively. It is easily performed by press-fitting each using deformation and fitting the peripheral edge of the fitting recess 11 into the fitting groove 12 formed on the outer periphery of the fixed portion 3A. At both ends of the vibration isolator 3, the fixed portion 3A and the abutting portions 3B that abut against the inner wall surface of the camera body 1 are integrally provided. The fixing portion 3 </ b> A has a screw mounting hole 13, and the set screw 7 is inserted into the screw mounting hole 13 and screwed into a screw hole formed on the inner bottom surface of the camera main body 1, thereby attaching the vibration isolator 3 to the camera main body 1. It is fixed to. Accordingly, the substrate 2 is held by the vibration isolation member 3 and is not in direct contact with the camera body 1. The abutting portion 3B extends toward the inner surface of the camera body 1 and is formed in a tongue-like shape. When the vibration isolator 3 is attached to the body body 1, the tip is pressed against the inner wall surface of the camera body 1. As shown by a solid line in FIG. 1, it is elastically deformed, thereby partitioning the inside of the camera body 1 into a drive unit side space 15A and a switch side space 15B. The top plate 6 is attached to the upper surface of the vibration isolation member 3 by the set screws 7 and 8.
[0010]
The drive unit 4 decelerates the rotation of the motor 17 to a known film rewinding mechanism (not shown) by a motor 17 attached to the end of the substrate 2 opposite to the vibration isolating member 3 by two set screws 16. And a gear train 18 composed of a plurality of gears 19, 20, 21, 22, 23. The gear 19 is fixed to the output shaft 24 of the motor 17. The gear 20 includes a large gear 20 </ b> A and a small gear 20 </ b> B that mesh with the gear 19, and is rotatably supported by a shaft 25 that is fixed between the substrate 2 and the top plate 6. The gear 21 includes a large gear 21 </ b> A and a small gear 21 </ b> B that mesh with the small gear 20 </ b> B, and is rotatably supported by a shaft 26 that is fixed between the substrate 2 and the top plate 6. The gear 22 is rotatably supported by a shaft 27 fixed to the substrate 2 and meshes with the small gear 21B. The gear 23 is rotatably supported by a shaft 28 provided between the substrate 2 and the top plate 6 and meshes with the gear 22. The rotation of the gear 23 is transmitted to the film rewinding mechanism to rewind the film that has been shot. The gears 19, 20, 21, 22, and 23 are coated with oil such as grease and lubricating oil in order to prevent wear, heat generation, and the like associated with driving.
[0011]
The switch 5 for detecting the open / closed state of the back cover includes a fixed contact 5A insulated from each other by an insulating member 31 and an elastic movable contact 5B. The insulating member 31 is fixed to one end of the substrate 2 by a set screw 30. Is located in the switch-side space 15B and faces the inner wall surface of the camera body 1 in close proximity. A pin 33 is provided on the wall surface of the camera body 1 so as to be capable of moving forward and backward corresponding to the free end of the movable contact 5B. The pin 33 is held in the state shown in FIG. 1 when the back cover is opened. In this state, the free end of the movable contact 5B is in contact with the contact portion 51 of the fixed contact 5A. When the back cover is closed, the pin 33 enters the camera body 1 and presses the movable contact 5B. 1 is separated from the fixed contact 5A by being elastically deformed as indicated by a broken line.
[0012]
In such an anti-vibration and oil-proof device for a camera, it is possible to simultaneously prevent vibration transmission to the camera body 1 and the scattered oil from adhering to the switch 5 with one member. That is, since the substrate 2 is not directly fixed to the camera body 1 and is held by the vibration isolation member 3, the vibration of the substrate 2 due to the drive of the drive unit 4 is absorbed by the vibration isolation member 3, and the camera body 1 Not transmitted.
Further, since the drive unit side space 15A and the switch side space 15B are partitioned in the camera body 1 by the vibration isolating member 3, even if oil applied to the gears 19 to 23 of the drive unit 4 is scattered, the switch side. It does not enter the space 15B and adhere to the switch 5. Moreover, the intrusion of dust can be prevented. Therefore, the switch 5 does not cause a contact failure, and the open / closed state of the back cover can be reliably detected.
In addition, since the vibration isolating member 3 also serves as an oil preventing member that protects the switch 5 from scattering of oil, the number of parts and the number of assembling steps can be reduced and can be provided at low cost.
[0013]
FIGS. 4A and 4B are views showing other embodiments of the vibration isolating member, respectively. In FIG. 6A, the vibration isolator 3 is formed in a plan view shape (L or J shape) as indicated by a two-dot chain line, and when attached to the camera body 1, the main body portion 3- An example is shown in which 1 is bent and the bent portion 3-2 provided on one end side is in close contact with the inner wall surface of the camera body 1. FIG. 2B shows an example in which the outer periphery is thickened by tightening the fixing portion 3 </ b> A of the vibration isolating member 3 with a set screw 7 and is in close contact with the inner wall surface of the camera body 1. In addition to the above, the shape of the vibration isolation member 3 can be variously modified and changed. In short, any shape may be used as long as the space between the drive unit 4 and the switch 5 is partitioned.
[0014]
In the above-described embodiment, the example in which the drive unit 4 of the film rewinding mechanism and the switch 5 for detecting the opening / closing operation of the back cover are provided in the vicinity of the substrate 2 has been described. However, any drive unit and switch may be used as long as they are attached to the board.
[0015]
【The invention's effect】
As described above, the anti-vibration and oil-proofing device for a camera according to the present invention has a substrate mounted in the camera body via an anti-vibration member, and a drive comprising a motor and a gear train that transmits the driving force of the motor to the substrate. In a camera in which a unit and a switch contact are provided close to each other, the anti-vibration member is formed so as to partition a space between the drive unit and the switch contact, and an end thereof is brought into close contact with the inner wall surface of the camera body. Therefore, the vibration of the substrate is absorbed by the vibration isolating member and prevented from being transmitted to the camera body, and the oil applied to the gear constituting the drive unit is prevented from scattering and adhering to the switch contact. be able to. Therefore, the reliability of the contact operation of the switch can be maintained over a long period. In addition, since the vibration-proof member also serves as the oil-proof member, in other words, since the vibration-proof member and the oil-proof member are integrally formed, it is not necessary to provide the vibration-proof member and the oil-proof member independently, Assembly man-hours can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a film winding and rewinding mechanism portion of a camera provided with a vibration and oil proof device according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a perspective view of a vibration isolating member.
FIGS. 4A and 4B are views showing another embodiment of the vibration isolating member, respectively. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Camera body, 2 ... Board | substrate, 3 ... Anti-vibration member, 3A ... Fixed part, 3B ... Contact part, 4 ... Drive unit, 5 ... Switch, 5A ... Fixed contact, 5B ... Movable contact, 15A ... Drive unit side space , 15B ... switch side space, 17 ... motor, 18 ... gear train, 19-23 ... gear.

Claims (2)

In a camera in which a board is mounted in the camera body via a vibration isolating member, and a drive unit and a switch contact made up of a motor and a gear train for transmitting the driving force of the motor are provided close to the board.
An anti-vibration and oil-proof device for a camera, wherein the anti-vibration member is formed so as to partition a space between the drive unit and the switch contact, and an end portion thereof is in close contact with an inner wall surface of the camera body. . The anti-vibration and oil-proof device for a camera according to claim 1,
An anti-vibration and oil-proof device for a camera, wherein both ends of the anti-vibration member are in close contact with the inner wall surface of the camera body, and the switch contact is surrounded by the camera body and the anti-vibration member.

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