JPH054143U - Camera back lock mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The thickness of the lock mechanism can be reduced to further reduce the size of the camera body, and the switch operates in conjunction with the locking of the back cover. Ensure reliability. [Structure] The lock member 15 is provided on the back cover 14 side to reduce the thickness of the lock mechanism portion. The switch 27 provided on the camera body side is operated by the operating piece 31 formed integrally with the lock member 15. The switch 27 is operated in association with the locking operation of the back cover 14 by the locking member 15. The switch 27 does not operate when the case back 14 is not locked, which ensures high reliability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera back cover lock mechanism used in a camera such as an automatic winding type camera.

[0002]

[Prior Art]

 As is well known, a camera body such as a 35 mm camera is provided with a back cover which is opened when a film is exchanged. When a new film is loaded in the camera body, the back cover is closed by the user and locked to the camera body.

Further, when the back cover is closed and locked, a so-called self-rolling type camera, which automatically feeds the front end of a newly mounted film by a predetermined amount, is widely used. Is coming. Then, as described in, for example, Japanese Patent Laid-Open No. 56-70539 or Japanese Utility Model Publication No. 4-11989, the back cover is securely locked so that the idle feed control switch for the leading end of the film can be operated. There is something that works.

There are various mechanisms for operating the switch when the back lid is locked, but the one having the structure described below is usually used.

FIGS. 3 (a) and 4 (a) are plan sectional views of a film cartridge chamber portion of a camera in a conventional apparatus, and FIGS. 3 (b) and 4 (b) are front views showing a lock mechanism portion. FIG. 3 shows a state in which the back lid is closed, and FIG. 4 shows a state in which the back lid is open.

3 (a) and 4 (a), 11 is an inner case of the camera body, and this inner case 11 forms a storage chamber for the film cartridge 12, and the film cartridge It has a portion formed in an arc shape according to the outer shape of twelve. Reference numeral 13 denotes an outer case of the camera body, and one side edge portion of the outer case 13 is arranged so as to be spaced apart from the outer side of the inner case 11. Reference numeral 14 denotes a back lid that is openably and closably provided on the back surface of the camera body, and one side edge portion of the back lid 14 engages with a lock member 15 provided between the inner case 11 and the outer case 13. Locked.

FIGS. 3B and 4B show a lock mechanism by removing a part of the outer case 13, and the lock mechanism will be described below.

The lock member 15 has a vertically long slot 17 arranged on two straight lines, and engages with a guide pin 18 provided on the outer surface of the inner case 11 through the slot 17. The guide pin 18 is slidably supported in the vertical direction. The lock member 15 is constantly subjected to upward biasing force by the spring 19.

A locking claw 21 is formed upward on the right side of the lock member 15, and is provided on the back cover 14 side with the back cover 14 in FIG. 3B closed. Engage with the downward facing claw 22 and lock it. A locking claw 23 is provided above the claw 21. The locking claw 23 is formed downward from the upper part of the lock member 15, and the lower end is formed rightward. When the case back 14 shown in FIG. Engages with the claw 24 provided on the lock member 15 to lock the lock member 15 in the lower unlocked position.

Further, an operation piece 26 is formed on the left side of the lock member 15, and the user pushes down the operation piece 26 to move the lock member 15 to the unlocked position and the back cover 14 Unlock for.

Reference numeral 27 denotes a switch provided on the camera body side. The switch 27 is turned off when the lock member 15 is raised to the lock position shown in FIG. 3B, and unlocked as shown in FIG. 4B. It is configured to be turned on by descending to the position.

The switch 27 is connected to an electric circuit (not shown) on the camera body side. For example, when the switch 27 is turned off, the film front end is idled, and when it is turned on, the film feed motor is driven. Configure to lock the behavior of.

In the above structure, the lock member 15 is pushed down against the repulsive force of the spring 19, and the locking claw 23 engages with the claw 24 provided on the inner case 11 side, as shown in FIG. 4B. It is assumed to be in the unlocked position. In this state, the back cover 14 is opened and the film is replaced.

When the film exchange is completed and the back cover 14 is closed, the upper shoulder portion 22a of the locking claw 22 provided on the back cover 14 side abuts the locking claw 23 on the lock member 15 side, Remove it from the claw 24 on the camera body side. Therefore, the lock member 15 is lifted by the repulsive force of the spring 19, and the locking claw 21 formed upward engages with the locking claw 22 on the side of the case back 14 to close the case back 14. Lock to. The switch 27 is driven to the off state by the upward movement of the lock member 15, that is, the lock operation, and the film front end portion in the cartridge 12 is fed by a predetermined amount.

As described above, the device shown in FIGS. 3 and 4 is configured so that the switch operates in accordance with the locking of the back cover 14, and is a back cover locking mechanism suitable for an automatic winding type camera. However, as shown in FIGS. 3 (a) and 4 (a), since it has a triple structure including the inner case 11, the lock member 15 and the outer case 13, the thickness of this portion becomes large.

Since the thickness of each part is about 1.5 mm in a normal camera, the thickness of this part is 4. It becomes about 5 mm, and it is difficult to make the camera smaller and compact.

Therefore, in order to reduce the thickness of the lock mechanism portion described above, as shown in FIGS. 5 and 6, a lock member 15 is provided on the side of the back cover 14, and the locking claw of the lock member 15 is provided. It is conceived that a locking claw 22 that engages with 21 is provided on the inner case 11 side of the camera body side.

In the case of the configuration shown in FIGS. 5 and 6, a claw for engaging the locking claw 23 of the lock member 14 and locking the lock member 15 in the unlocked state shown in FIG. 6B. 24 is also provided on the back cover 14 side.

The functions of the above-mentioned parts and the functions of the parts related thereto are the same as those shown in FIGS. 3 and 4, and corresponding parts are denoted by the same reference numerals.

As shown in FIGS. 5 (a) and 6 (a), since the camera body has a double structure of an inner case 11 and an outer case 13, the thickness of this portion is as shown in FIGS. It can be set to about 3.0 mm, which is 2/3 of that shown in FIG.

However, in the case of such a configuration, it is difficult to provide the switch 27 on the side of the back cover 14 due to the wiring and the like, and therefore, as shown in FIGS. The switch 27 cannot be driven. For this reason, the switch 27 is mounted vertically on the camera body side as shown in the figure, and when the back cover 14 is closed, the switch 27 is turned off by the pressing element 14a provided on the back cover 14.

In the case of such a configuration, there is no problem if the switch 27 is turned off after the back cover 14 is completely closed and securely locked, but in actuality, a dimensional error and rattling are taken into consideration. The switch 27 is set to be turned off immediately before the back cover 14 is completely closed. For this reason, the switch may turn off before the back cover 14 is locked, and if you do not close it sufficiently until it is securely locked, automatic winding will be performed with the back cover 14 open. The film is wasted.

[0023]

[Problems to be solved by the device]

 In this way, the thickness of the lock mechanism portion becomes large, and if it is attempted to reduce the thickness, there is a problem in reliability.

An object of the present invention is to provide a camera back cover lock mechanism that can reduce the thickness of the lock mechanism unit and that ensures the reliability by operating the switch when the back cover is locked. To provide.

[0025]

[Means for Solving the Problems]

 The present invention is a camera back lid locking mechanism that locks a back lid that can be opened and closed on the back surface of the camera body in a closed state with respect to the camera body, and is slidably provided on the back lid side. A lock member that locks in engagement with a claw portion provided on the camera body side in the closed state; a spring that constantly urges the lock member in the engagement direction with the claw portion; An operating piece that is formed integrally with the member and that projects toward the camera body by sliding in the direction in which it engages with the claw portion of the lock member, and the locking piece that is provided on the camera body side that is the protruding position of the operating piece. A switch driven by the actuating piece by engaging operation of the member with the claw portion is provided.

[0026]

[Action]

 According to the present invention, the lock member is provided on the back cover side to reduce the thickness of the lock mechanism portion, and the switch provided on the camera body side is operated by the operating piece formed integrally with the lock member. Since the switch is operated in relation to the locking operation of the back cover by the lock member, the switch will not operate without the back cover being locked, ensuring high reliability.

[0027]

【Example】

 Hereinafter, an embodiment of a camera back cover lock mechanism of the present invention will be described with reference to the drawings.

1 (a) and 1 (b) are a plan view of the film cartridge chamber portion with the back cover closed and a front view of the lock mechanism portion, and FIGS. 2 (a) and 2 (b) are rear views. FIG. 3 is a plan view and a front view of the same with the lid open.

This configuration has many parts in common with those shown in FIGS. 3 to 6, and the same reference numerals are given to them.

In the figure, the inner case 11 and the outer case 13 which form the accommodation chamber of the film cartridge 12 of the camera body have the same double structure as those shown in FIGS. The thickness is reduced to about 2/3, 3.0 mm.

A lock member 15 is slidably supported by a guide pin 18 through an elongated hole 17 on the outer side of one side edge of the back cover 14, and is biased upward by a spring 19. ing. Further, a locking claw 21 is formed upward on the left side of the lock member 15, and a locking claw 23 is provided above the locking claw 21. The locking claw 23 is provided on the back cover 14 shown in FIG. In the opened state, the lock member 15 is engaged with the claw 24 provided on the side of the back cover 14 to lock the lock member 15 in the lower unlocked position.

As shown in FIG. 2 (a), one end of the inner case 11 is in a positional relationship so as to be flush with the lock member 15, and a portion facing the locking claw 21 has a position shown in FIG. In the closed state of the back lid 14 of (b), a locking claw 22 that engages with the locking claw 21 and locks the back lid 14 is formed.

Further, an operating piece 31 for operating the switch 27 is integrally formed on the lock member 15. The operating piece 31 projects upward through a hole 32 formed on the camera body side by the locking operation of the locking member 15, that is, by the upward sliding. The switch 27 is provided on the side of the camera body where the operating piece 31 protrudes, and is pushed up by the operating piece 31 as the locking member 15 is locked, and is driven to the off state.

In the above structure, the lock member 15 is pushed down against the repulsive force of the spring 19, and the locking claw 23 is in the unlocked position where the locking claw 23 is engaged with the claw 24 as shown in FIG. 2B. And In this state, the back cover 14 is opened and the film is replaced.

When the film exchange is completed and the back cover 14 is closed, the locking claw 23 on the lock member 15 side comes into contact with the upper shoulder 22a of the locking claw 22 provided on the inner case 11 side. The pawl 23 comes off the pawl 24. Therefore, the locking member 15 is lifted by the repulsive force of the spring 19, and the locking claw 21 formed upward engages with the claw 22 on the inner case 11 side to lock the back cover 14 in the closed state. To do.

Further, with this locking operation, that is, as the lock member 15 moves up, the operating piece 31 formed integrally with the lock member 15 also moves up and pushes up the contact piece of the switch 27 through the hole 32 to turn it off. Drive to the state. Therefore, automatic winding is performed, and the film front end portion in the cartridge 12 is fed by a predetermined amount.

Here, the operation of the switch 27 to the off state is performed in accordance with the locking operation of the lock member 15, and the switch is not driven without the back cover 14 being locked, and the operation is high. The reliability can be obtained.

[0038]

[Effect of the device]

 According to the camera back cover lock mechanism of the present invention, the lock member is provided on the back cover side to reduce the thickness of the lock mechanism portion, and the switch provided on the camera body side is integrated with the lock member. Since the switch is operated in association with the lock operation of the back cover by the lock member, the thickness of the lock mechanism can be reduced and the camera can be made more compact. In addition to being able to proceed, the switch operates so that the back cover is securely locked, resulting in high reliability.

[Brief description of drawings]

FIG. 1A is a plan cross-sectional view showing an embodiment of a back cover locking mechanism of a camera according to the present invention when a back cover is closed. (B) It is a partial front view same as the above.

FIG. 2 (a) is a plan sectional view showing the device shown in FIG. 1 in a state where the back cover is open. (B) It is a partial front view same as the above.

FIG. 3A is a plan sectional view showing a state where the back cover is closed in the conventional back cover locking mechanism of the camera. (B) The same partial front view.

FIG. 4 (a) is a plan sectional view showing the state shown in FIG. 3 with the back cover open. (B) The same partial front view.

FIG. 5A is a plan sectional view showing a state where a back cover is closed in a back cover locking mechanism of another conventional camera. (B) The same partial front view.

6 (a) is a plan sectional view showing the state shown in FIG. 5 with the back cover open. (B) The same partial front view.

[Explanation of symbols]

 14 Back cover 15 Lock member 19 Spring 22 Claw 27 Switch 31 Actuator

Claims (1)

[Claims for utility model registration] [Claim 1] A camera back cover lock mechanism for locking a back cover openably and closably provided on the back surface of the camera body to the camera body in a closed state, And a lock member that is slidably mounted on the side and that locks by engaging with a claw provided on the camera body side in the closed state, and this lock member is always attached in the direction of engagement with the claw. A biasing spring, an operating piece integrally formed with the lock member, the operating piece protruding toward the camera body side by sliding in a direction of engaging with the claw portion of the locking member, and the camera body serving as a protruding position of the operating piece. And a switch that is provided on the side of the lock member and is driven by the operation piece by the engaging operation with the claw portion of the lock member.