JPH01287549A - Camera - Google Patents

Abstract

PURPOSE:To facilitate manufacture by electrically conducting a core bar and a lens board through conductive tap bolts. CONSTITUTION:The metallic lens board 4 is fitted firmly to a camera body 3 consisting of the metallic core bar 1 and a resin body 2 through plural tap bolts 5, moreover a finder device, a rear cover, etc., are fitted thereto, and inner mechanisms such as a film feeder are assembled, following which an armor cover is applied to constitute the camera. The tap bolt 5 is made of metal and has conductivity, and its head 5A abuts on the core bar 1. Simultaneously its screw part 5B is screwed into the screw hole 4b of a fitting boss part 4A, whereby the core bar 1 and the lens board 4 are electrically conducted. Thus, the core bar 1 can be obtained by press-molding an easy-to-produce and highly accurate flat plate, and in addition, the butting surface of the side of the camera body 3 can be readily formed by resin formation at high accuracy.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has the advantage that the overall shape can be made freely by using resin that can be easily molded into various shapes, while the passing portion of the film is made of metal. The present invention relates to a camera having a camera body called a hybrid body of resin and metal, which can be used to improve flatness and improve the stability of film running.

More specifically, a camera body includes a metal core having a film guide surface and a resin body body molded to enclose at least a portion of the core.
A contact surface is formed on the mounting boss part of the conductive lens board that is at ground potential to regulate the relative posture of the camera body and the mounting boss part, and a through hole formed in the core metal is inserted through the contact surface. A holding bolt is provided for fixing the lens board to the camera body by screwing into a screw hole formed in the mounting boss portion, and a conduction bolt is provided for electrically conducting the core metal and the lens board. By providing a conductive means, the static electricity generated on the core bar due to contact with the film as it passes through the film is released to the lens board, thereby preventing noise from entering various electronic circuits such as the micro combi coater installed in the camera. Regarding the camera that can be prevented.

[Conventional technology]

Among the above-mentioned cameras, one having the configuration shown in FIG. 4 is conventionally known. In this configuration, a plurality of core metal boss portions (1x) that bulge toward the mounting boss portion (4^°) side of the lens board (4゛) are attached to the core metal (1゛). ) are integrally arranged in a state protruding from the surface of the resin body main body (2°) in which the metal core boss part (1x) is attached, and the surface (Ic') on the side of the mounting boss part (4A') ) to form a contact surface on the camera body (3°) side, and attach the lens board (4
′) are respectively brought into contact with the contact surfaces (4a′) of the plurality of mounting bosses (4A′) formed on the
5'), respectively, the core metal (1°) and the core metal boss part (
1x) and the screw hole (4b'') formed in the mounting boss part <4A').
By screwing them together, the lens board (4') is fixed to the camera body (3'). Then, the metals of the plurality of core metal bosses (1x) connected to the core metal (1°) and the plurality of mounting bosses (4A'') formed on the lens board (4'') are connected to each other. With the abutting configuration, the core metal (1°
) and the lens board (4 degrees).
(See Publication No. 19).

[Problem to be solved by the invention]

However, the conventional camera described above has the following problems.

In other words, in order to securely attach the lens board and camera body without any looseness, it is necessary to make sure that each mounting boss protrudes from the lens board body according to the design, and that each core metal boss protrudes from the core metal. In addition to adjusting the amount as designed, it is necessary to improve the surface precision of the contact surfaces on the lens body side and the mounting boss side.

On the other hand, the lens board has a series of mounting bosses, and the core of the camera body has a series of core bosses, both of which have uneven shapes. Molding of gold has no choice but to rely on guicast molding. However, when using Guicast molding, the dimensional accuracy of each part is currently not very high.

Therefore, if you try to securely fix the lens board and camera body when both the lens board and the core metal are Gui-cast molded, after molding, not only the mounting boss part on the lens board side but also the core metal of the camera body The end face of the boss also had to be machined so that the desired amount of protrusion from the core metal and the desired surface accuracy could be obtained.

In summary, in conventional cameras, a part of the core metal is bulged out and brought into contact with the mounting boss part of the lens board, so that the core metal is electrically connected to the lens board. There was a problem that required a lot of machining on the surface.

In view of the above-mentioned circumstances, an object of the present invention is to provide an easy-to-manufacture structure for establishing electrical continuity between a hybrid camera body and a lens board.

[Means to solve the problem]

A first means for solving the above problems according to the present invention is:
The contact surface on the camera body side is formed from a resin body main body molded to enclose at least a part of a metal core having a film guide surface, and the presser bolt is at ground potential and attached to the camera body. To configure the conduction means for electrically connecting the conductive lens board and the cored metal, which are fixed with The part of the periphery on the opposite side of the lens board is exposed in a wider area than the head of the holding bolt, and the holding bolt is inserted into the through hole of the core metal with the head in contact with the exposed part, and the lens is removed. It is screwed into a screw hole formed in the mounting boss part of the board.

Further, a second means for solving the above problems according to the present invention is to provide a camera body that includes a metal core that is at least partially enclosed in a resin body, and a camera body that is made of the body and the core. To constitute the conduction means for electrically connecting the conductive lens board that is fixed with a bolt and is at ground potential, the portion of the periphery of the through hole of the core metal through which the presser bolt is inserted, on the lens board side, is The contact surface on the camera body side is exposed in a wider area than the mounting boss part of the lens board in which the screw hole into which the presser bolt is screwed is formed, and the contact surface on the mounting boss part side is in the exposed part. This is due to the fact that they are in contact with each other.

[For production]

In the case of the former method, the head of the presser bolt made of a conductive material comes into contact with the part of the core bar on the opposite side of the lens board, which is exposed over a wider area than the head. By making contact with each other and by screwing the threaded part of the holding bolt into the screw hole formed in the mounting boss part of the lens board, the core metal and the lens board are electrically connected via the conductive holding bolt. This eliminates the need to form a boss on the core metal for contacting the lens board mounting boss, making it possible to obtain the core metal by pressing a flat plate and reducing the weight of the core metal. On the other hand, since the contact surface on the camera body side is formed from the resin body,
By resin molding, this contact surface can be easily formed with high precision and at a desired position from the core bar. In addition, the structure on the lens board side is almost the same as the conventional structure, so that there is no need to complicate the machining process.

In addition, in the case of the latter method, the contact surface formed on the mounting boss part of the lens board is exposed in a wider area than the mounting boss part on the lens board side around the through hole of the core bar. Since the core metal and the lens board are directly electrically connected by contacting with the metal core, even if the boss portion does not protrude from the core metal and the surface of the core metal on the lens board side is formed flat. The core metal and the lens board can be electrically connected, and the core metal can be obtained by pressing a flat plate. As a result, the contact surface on the camera body side can be formed as a flat plate surface with good surface precision. Moreover, there is no need to make any major changes to the configuration of the lens board, and it is only necessary to slightly increase the amount of protrusion of the mounting boss from the board body by the amount of the core boss in the conventional configuration, which reduces the complexity of processing. It will not lead to any change.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

(Example 1) As shown in Fig. 1, it is composed of a metal core (1) and a resin body body (2) molded to enclose the core (1). Gold r on camera body (3)
Hold R lens board (4) with multiple holding bolts (5)
In addition, after attaching a finder device, back cover, etc. (not shown), and assembling internal mechanisms such as a film transport device, an exterior cover is applied to configure the camera.

The core metal (1) has a film guide surface (IG) on the opposite side from the lens board (4), and guides the conveyance of the film within the film path formed between it and the back cover. It is configured as follows. And this core metal (1)
A rectangular opening (la) is formed in the opening to define the exposure range for the film.

Next, the mounting structure between the camera body (3) and the lens board (4) will be explained. As shown in Figure 2, the core metal (1
), there is a through hole for the mounting bolt (5) (
1b) is formed, and a through hole (2a) is formed in a portion of the main body (2) corresponding to the through hole (1b).

Then, around the through hole (lb) of the core bar (1), attach the presser bolt (5) to the part on the opposite side of the lens board (4).
) is exposed over a wider area than the head (5A). On the other hand, the lens board (4) has a mounting boss 1l (4A) integrally connected thereto, and a screw hole (4b) opening in the end surface (4a) of the mounting boss portion (4A) is formed. ing.

The camera body (3) and lens board (4) are the lens board (2) of the body (2) of the camera body (3).
The end surface (4a) of the mounting boss portion (4^) of the lens board (4) comes into contact with the surface (2b) on the 4) side, so that their relative postures are regulated. That is, the surface (2b) of the body main body (2) on the lens board (4) side
) and the end surface (4a) of the mounting boss (4A) are the contact surfaces between the camera body (3) side and the mounting boss (4A) side.

The presser bolt (5) has its head (5A) in contact with the exposed portion (IA) of the core metal (1),
It is inserted into the through hole (1b) of the core metal (1) and the through hole (2a) of the body main body (2), and its threaded part (5B) is screwed into the screw hole (4h) of the mounting boss part (4A). By being combined,
A lens board (4) is configured to be fixed to a camera body (3).

This holding bolt (5) is made of metal and has conductivity.
Its head (5^) comes into contact with the core metal (1), and its threaded part (5B) is inserted into the screw hole (4b) of the mounting boss part (4A).
), the core bar (1) and lens board (4)
There is electrical continuity between the two. This core metal (1) is at ground potential and constitutes a so-called body ground. Therefore, as the film (F) located between the pressure plate (6) attached to the back cover and the core metal (1) passes through, the static electricity generated on the core metal (1) due to contact with the film (F) can be reduced. The lens board (4), which is at ground potential, can be
It is possible to prevent noise from entering an electronic circuit such as a micro-combination unit for operation control provided in the camera, thereby avoiding malfunction of the camera.

That is, by forming the holding bolt (5) from a conductive material and by using the holding bolt (5) to fix the lens board (4) to the camera body (3) as described above, the holding bolt (5) is made of a conductive material. constitutes a means.

Then, as described above, by electrically connecting the core bar (1) and the lens board (4) via the conductive holding bolt (5), the lens board (4) is connected to the core bar (1). It is no longer necessary to provide a boss or the like for making contact with the metal core (1), and it becomes possible to obtain the core metal (1) by pressing a flat plate in addition to gui-casting. Moreover, since the presser bolt (5) that constitutes the conduction means is originally a part for fixing the camera body (3) and the lens board (4), it is necessary to prepare a special part as the conduction means. do not have. Also, the camera body (3) and lens board (4)
) The precision of the contact surface required for reliable attachment to the camera body (3) can be easily increased by forming the contact surface on the camera body (3) side from the body body (2) made of resin molding. Therefore, as a whole, the structure is designed to ensure electrical continuity between the core metal (1) and the lens board (4) while making it possible to securely fix the camera body (3) and the lens board (4). , it can be advantageous in terms of production. Furthermore, since there is no need to provide a boss made of a lump of metal to the core metal (1), the weight of the camera can also be reduced.

(Example 2) In this (Example 2), the mounting structure between the camera body (3) and the lens board (4) is different from that in (Example 1).
) is different from Therefore, in the following explanation, only the main parts including the differences will be explained, and detailed explanation will be omitted.

It should be noted that parts with the same numbers in the drawings are the same parts as in the previous embodiment.

As shown in Fig. 3, as in the previous example (1), a presser bolt (5) is attached to the core metal (1) of the camera body (3).
A through hole (1b) is formed for the lens board (
4), there is a mounting boss part (4) with a screw hole (4b) formed therein.
A) are connected in series.

Then, around the through hole (1b) of the core metal (1),
Attach the lens board (4) side part to the mounting boss part (4^
), and the exposed area is smaller than IB.
) is brought into contact with the end surface (4a) of the mounting boss (4^).

In addition, attach the holding bolt (5
) is exposed in a wider area than the head (5A) of the metal core (1), and insert the presser bolt (5) into the through hole (1b) of the core metal (1) with the head (5A) in contact with the exposed part (IA). Insert it,
The camera body (3) and lens board (4) are fixed together by screwing into the screw hole (4b) of the mounting boss (4A).

That is, the surface (I) of the core metal (1) on the lens board (4) side
C) and the end surface (4a) of the mounting boss (4^) are the contact surfaces of the camera body (3) and the mounting boss (4^). In addition, direct contact between the mounting boss portion (4A) of the metal lens board (4) and the core metal (1) establishes electrical continuity between the core metal (1) and the lens board (4). This configuration constitutes the conduction means.

Then, as described above, by bringing the mounting boss part (4A) of the lens board (4) into direct contact with the core bar (1) and electrically conducting the two, the lens board (4A) is attached to the core bar (1). 4
), it is no longer necessary to continuously install a boss etc. for contact with the metal core (1), and as in the previous example (Example 1), it is possible to obtain the core metal (1) by pressing a flat plate in addition to Guicast molding. It is. Also in this embodiment, the presser bolt (5) is connected to the camera body (3) and the lens board (4).
), there is no need for special parts constituting the conduction means. Furthermore, the accuracy of the contact surface on the camera body (3) side can be easily increased by obtaining the core metal (1) from a flat plate by press working. Therefore, as a whole, while making it possible to securely fix the camera body (3) and lens board (4),
A configuration for electrically conducting the core metal (1) and the lens board (4) can be advantageously obtained in terms of manufacturing.

In addition, in this embodiment, the through hole (1b
), the part on the opposite side from the lens board (4) is exposed in a wider area than the head (5A) of the presser bolt (5), and the presser bolt (5) is attached to the exposed part (IA). By bringing the heads (5A) of the bolts into contact with each other, the core bar (1) can firmly absorb the force applied when tightening the retainer bolt (5). In addition, instead of this configuration, although not shown, a through hole is formed in the part of the core bar (1) opposite to the lens board (4) in the part corresponding to the through hole (1b) of the core bar (1). It may be covered with a body main body (2) formed with a metal core (1) and completely encapsulate the core metal (1). However, the embodiment shown in FIG. 3 is more preferable because it prevents the presser bolt (5) from sinking into the resin body main body (2) due to tightening. Also,
In the configuration of this (Embodiment 2), the presser bolt (5) does not necessarily need to be formed from a conductive member such as metal. Note that the lens board (4) is not only made of metal, but may also be made of plastic mixed with carbon, for example, and the present invention can be applied to such cameras in exactly the same way.

〔Effect of the invention〕

As described above, in the case of the camera according to the first means, the core metal of the camera body and the threaded portion of the presser bolt are in contact with the head of the presser bolt via the conductive presser bolt. By creating electrical continuity between the lens board and the lens board to which it is screwed together, it is possible to obtain the core metal by pressing from a flat plate that is easy to manufacture and has high precision. Since the surface can be easily and accurately formed by resin molding, it is possible to obtain a configuration that reliably regulates the relative posture between the camera body and the mounting boss part, which is advantageous in terms of manufacturing. Since it is possible to avoid complication in terms of surface area, the overall structure for electrically conducting the core metal to the lens board can be made advantageous in terms of manufacturing. Furthermore, in addition to this, the first method eliminates the need for the boss to protrude from the core metal, which was formed as a lump of metal in the conventional configuration and was a factor in increasing the weight of the camera. By doing so, we were able to reduce the weight of the entire camera.

Further, in the case of the camera according to the second means, the mounting boss portion of the lens board is brought into direct contact with the core bar to electrically conduct the core bar and the lens board,
The core metal is easy to manufacture and can be obtained by press processing from a flat plate with high precision, and the contact surface on the camera body side is formed on the core metal to ensure the relative relationship between the camera body and the mounting boss. A configuration for reliably regulating the posture can be advantageously obtained in terms of manufacturing, and it is also possible to avoid significant complication in terms of manufacturing on the lens board side. We were able to create a configuration that is advantageous in terms of manufacturing.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the camera according to the present invention, FIG. 1 is a schematic perspective view of the whole, and FIG. 2 is (Embodiment 1)
FIG. 3 is a sectional view of the main part of (Embodiment 2). FIG. 4 is a sectional view of a main part showing a conventional example. (1)...Core metal, (1a)...Through hole, (IG)...Film guide surface, (LA),
(1B)...Exposed part, (2)...
Body body, (3)...Camera body, (4)
... Lens board, (4b) ... Screw hole, (5) ... Holding bolt, (5A) ...
・・Head, (lc), (2b), (4a)---・-
・The side to hit.

Claims (1)

[Claims] 1. A camera body consisting of a metal core having a film guide surface, a resin body body molded to enclose at least a part of the core, and a camera body that is connected to a ground potential. A contact surface is formed on the mounting boss portion of a certain conductive lens board to regulate the relative posture between the camera body and the mounting boss portion, and a through hole formed in the core metal is inserted into the mounting boss portion of the conductive lens board. A presser bolt is provided for fixing the lens board to the camera body by screwing into a screw hole formed in the mounting boss portion, and a conduction means is provided for electrically conducting the core metal and the lens board. In a certain camera, the contact surface on the camera body side is formed from the body main body, and the holding bolt is formed from a conductive member to constitute the conduction means, and the part around the through hole of the core metal is formed from a conductive member. A portion on the opposite side of the lens board is exposed in a wider range than the head of the presser bolt, and the presser bolt is inserted into the through hole with the head in contact with the exposed portion and inserted into the screw hole. A camera screwed together. 2. A camera body consisting of a metal core having a film guide surface and a resin body body molded to enclose at least a portion of the core, and a metal lens board at ground potential. A contact surface is formed on the mounting boss part for regulating the relative posture of the camera body and the mounting boss part, and a through hole formed in the core metal is inserted into the mounting boss part. In the camera, a presser bolt is provided for fixing the lens board to the camera body by screwing into a screw hole of the camera body, and a conduction means is provided for electrically conducting the core metal and the lens board. To configure the conduction means, a portion of the periphery of the through hole of the core bar on the lens board side is exposed in a wider range than the mounting boss portion to form a contact surface on the camera body side, and the exposed portion is exposed in a wider area than the mounting boss portion. A camera in which a contact surface on the side of the mounting boss portion is brought into contact with the part.