JPH02198404A - Optical equipment - Google Patents

Abstract

PURPOSE:To reduce the contact resistance, and also, to lower the possibility of the separation of both which follows up the movement of a contact by connecting the contact and a conductive member whose electric resistance is small to the contact of a movable side where the low contact resistance is requested, so that turning the contact is suppressed. CONSTITUTION:A contact supported so as to be freely movable in the contact direction is connected directly to a linear or band-like conductive member with an adhesive material such as solder so that the conduction to a circuit can be obtained, and also, it is provided against a supporting member so that the contact cannot turn. In such a manner, when a connecting member such as a lead wire is used in order to reduce the contact resistance of a movable contact, an optical equipment which prevents the separation of the movable contact and the connecting member and makes the contact part compact can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to optical devices such as camera bodies and interchangeable lenses.

[Prior art]

2. Description of the Related Art Camera systems are known in which optical accessories such as interchangeable lenses, intermediate tubes, and various types of lenses can be attached and detached from a camera body using a mount system.

In recent years, camera systems have become increasingly computerized, creating a need for communication and power supply between camera bodies and optical accessories. For this purpose, electrical connection terminals such as contact pins are provided on both mounts, and when both mounts are rotated and attached, the electrical connection terminals on both sides are brought into contact to supply power from the camera body side to the optical accessory side. , reading the ROM contents in the optical accessory;
Alternatively, various camera systems have been proposed that control actuators within optical accessories.

In the above-described camera system, the applicant claims that in the contact between the electrical connection terminal on the camera body side and the electrical connection terminal on the accessory side, for the connection terminal related to the power supply,
Japanese Patent Application No. 61-37484 and Japanese Patent Application No. 61-1987 propose that the contact pressure be increased compared to other types in order to reduce the contact resistance.
It is proposed as No. 3-259198. In this proposal, the spring pressure of the coil spring that applies contact pressure to both electrical connection terminals is set to be thicker only for the connection terminal related to the power supply.

[Problem that the invention is trying to solve] However,
Since the above-mentioned proposal uses the coil spring itself as an electrical conduction path, it cannot cope with the case where the contact resistance is set to a small value such as 0.1 Ω or less. This is because the electrical resistance value of the coil spring itself already greatly exceeds 0.1Ω.

[Purpose and characteristics of the invention]

For movable contacts that require particularly low contact resistance, the present invention connects the contacts to a conductive member with low electrical resistance so that an elastic pressing member such as a coil spring is not used as a conductive path. To provide an optical device such as a camera body, an interchangeable lens, an intermediate tube, an extender, etc., which can reduce the possibility of separation of the two due to movement of the contact point.

〔Example〕

1 to 6 show an embodiment in which the present invention is applied to a video camera system. In the figure, l is a video camera body, 2 is a rotatable bayonet mount camera mount fixed to the video camera body 1, and a mount abutment surface 2 serves as a reference in the optical axis direction.
a and three mount claws 2b are formed. Reference numeral 3 denotes a leaf spring that comes into contact with a mount claw of a lens mount, which will be described later, and brings the mount abutting surfaces of both the camera mount 2 and the lens mount into close contact. 4 is an optical filter, 5 is a camera-side contact block, and 6 is a camera-side contact as an electrical connection terminal movably supported in the optical axis direction 0-O', which is the contact direction with respect to the camera-side contact block 5. Yes, total 6 from 6a to 6f
Individually arranged. Reference numeral 7 designates conductive springs that elastically bias the camera side contacts 6a to 6f in the contact direction, and a total of six conductive springs 7a to 7f are provided. Reference numeral 8 designates a printed circuit board that is electrically connected to the camera side contacts 6b to 6e via springs 7b to 7e, and a pattern is formed at a position corresponding to each of the camera side contacts 6b to 6e (springs 7b to 7e). The camera-side contacts 6a and 6f are electrically connected to a predetermined pattern on the printed circuit board 8 through lead wires 22 (described later). Reference numeral 9 denotes a lock pin, which can be moved from a position protruding from the mount abutting surface 2a to a retracted position by an operation member (not shown), and enables locking and unlocking when the lens mount is mounted. 10 is an interchangeable lens as an optical accessory; 11 is a rotationally detachable bayonet mount type lens mount fixed to the interchangeable lens 10; a mount abutment surface 11a serving as a reference in the optical axis direction; A mount claw 11b is formed. 12 is an imaging lens, 13 is a lens side contact stand, and 14 is a lens side contact stand 13.
A total of six contacts 14 a- 14f is provided. Reference numeral 15 denotes a lock groove into which the lock pin 9 is inserted when both mounts 2.degree. 11 are rotated and mounted, thereby locking the mount. Note that the center position of the camera side contacts 6a to 6f is located at the lock pin 9.
The center positions of the lens-side contacts 14a to 14f are also arranged approximately 90 degrees apart from the lock groove in the direction around the optical axis.

In this embodiment, 6a and 6f are camera-side contacts related to the power supply. Specifically, the camera-side contact 6a is for ground, and the camera-side contact 6f is for high potential. 6b
-6e are camera-side contacts related to communication, and have a clock line, a camera->lens transmission line, and a lens->camera transmission line.

The camera side contact 6f (one side for power supply) is separated from the other camera side contacts 6a to 6e (other side for communication and power supply) by providing a height difference in the contact direction (optical axis direction). Trying to be different. In this state, as shown in Figure 4(a) before installation, only the camera side contact 6f changes its height backward (toward the image sensor side) in the optical axis direction 〇-〇' (see Figure 1). Supported. Further, only the springs 7a and 7f for urging the camera-side contacts 6a and 6f related to the power source in the contact direction are set to have a larger urging force than the other springs 7b to 7e. This is the camera side contact 6a~
When 6f contacts the lens side contacts 14a to 14f, the contact pressure of the power contacts 6a, 6f, 14a, 14f is higher than that of the communication contacts 6b to 6e, 14b to 14e.
This is done with the purpose of increasing the contact pressure and reducing the contact resistance.-In terms of design, the power supply contacts, which are the power source for motors, etc., and the communication contacts (for communication or IC
The allowable limit contact resistance is different from that of the dedicated power supply (dedicated power supply).
For example, if the allowable contact resistance of the power contact is 0.1Ω or less, the allowable contact resistance of the communication contact is 1Ω or less.

Furthermore, as is clear from the mid-mounting state shown in FIG. 4(b), the lens-side contacts 14a to 14e, which do not correspond to the camera-side contact 6f whose height has been changed, slide when the mount is rotated. The protruding height of the camera side contact 6f is set lower than the other camera side contacts 6a to 6e (shifted toward the front side of the optical axis) so that the camera side contact 6f does not move. In addition, the camera side contact 6
The lens side contact 14f corresponding to f is set to have a protruding height higher than the other lens side contacts 14a to 14e (shifted toward the front side of the optical axis), and is connected to the camera side contact 6f at the end of the mounting rotation of the mount. It is meant to be in contact. Note that the camera side contacts 6a to 6e and the lens side contacts 14a to 14e are the corresponding contacts 6a and 14a, contacts 6b and 14b, respectively.
Contacts 6c and 14c, contacts 6d and 14d, and contact 6e
and 14e come into contact at the end of the mounting rotation of the mount.

To explain the mounting rotation operation of the mount, FIG. 4(a) shows a state in the initial stage of mounting, in which none of the camera-side contacts 6a to 6a and the lens-side contacts 14a and 14f are in contact.

When the interchangeable lens 10 is rotated from the state shown in FIG. 4(a) and the lens side contact base 13 is moved in the direction of arrow X to the position shown in FIG. 4(b), the camera side contact 6e and 6d rides on the inclined surface 13a of the lens side contact base 13 and slides on the surface of the contact base 13 (on the surface at the same height as the contacts 14a to 14e). FIG. 4(b) shows a state in the middle of the mounting rotation of the mount.

FIG. 4(C) shows the completed state of mounting rotation of the mount,
From the state shown in FIG. 4(b), the interchangeable lens 10 is further rotated to move the lens side contact base 13 in the direction of arrow X. Here, corresponding contact points on the lens side and the camera side are in contact with each other.

To explain specifically the mounting process of each contact, the camera side contact 6f is not in contact (does not slide) with the lens side contacts 14a to 14e in the phase opposite to the lens side contacts 14a to 14e, and at the end of the mounting rotation. The inclined surface 13 of the lens side contact base 13
b and comes into contact with the lens side contact 14f. Then, the camera side contact 6e rides on the inclined surface 13a, slides on the lens side contacts 14a to 14d, and finally comes into contact with the corresponding lens side contact 14e. Similarly, the camera side contact 6d rides on the inclined surface 13a, and the lens side contact 14
After sliding a to 14c, the corresponding lens side contact 14d
The camera-side contact 6c rides up the inclined surface 13a, slides over the lens-side contacts 14a and 14b, and then contacts the corresponding lens-side contact 14c, and the camera-side contact 6b rides up the inclined surface 13a and slides over the lens-side contacts 14a and 14b. After the contact 14a slides, it comes into contact with the corresponding lens-side contact 14b, and further, the camera-side contact 6a rides up the inclined surface 13a and comes into contact with the corresponding lens-side contact 14a. What is important here is that 6a and 6f, which have a higher contact pressure than the others among the camera side contacts, slide with the lens side contact once each when the mount is attached and rotated. By reducing the contact resistance of the contacts related to the power supply, we have eliminated the negative effects caused by increasing the contact pressure, that is, the sliding with other contacts, such as the lens side contacts 14b to 14e, thereby reducing wear due to sliding. In addition, the camera-side contacts 6a and 6f, which are related to power supply, and the lens-side contacts 6b to 6e, which are related to communication, do not slide when the mount is attached and rotated. There is no electrical damage to the circuit inside the interchangeable lens 10.In addition, the camera side contact 6a
6f and the lens side contacts 14a to 14f (the sum of the number of times each contact slides) can be reduced to reduce the wear of the contacts. Furthermore, a contact point 6a related to the power supply
and 6f (14a and 14f) are separated from each other at both ends and have different heights, so that the possibility of short-circuiting due to the proximity of conductors can be minimized.

The various effects described above are firstly achieved by forming the camera-side contact 6f and the lens-side contact 14f, which are on the rear side in the rotational mounting direction of the interchangeable lens 10, in a stepped shape in the contact direction with respect to other contacts. Therefore, if the contacts 6f and 14f are not stepped, the camera-side contact 6f will slide against all of the lens-side contacts 14a to 14f when the mount is rotated. Second, the contacts 6a and 6f related to the power supply
This is achieved by arranging (14a and 14f) apart at both ends (between which contacts 6b to 6e and 14b to 14e related to communication were arranged) and by increasing the contact pressure.

Note that the inclined surface 13b of the lens-side contact base 13 has a larger angle of inclination than the other inclined surface 13a, so that the contact 14
The distances between e and 14f and between contacts 6f and 6e are kept from widening.

Next, characteristics of this embodiment will be explained. The contacts 6a and 14a, 6f and 14f related to the power supply have a smaller allowable value of contact resistance than the other communication contacts 6b to 6e and 14b to 14e. For example, if the allowable value of contact resistance of contacts 6a and 14a, 6f and 14f related to power supply is set to 0.1Ω or less based on specifications, coil springs 7b to 7e are used as conductive paths like other communication contacts. I can't. This is because as long as a coil spring is made of a normal conductive material, its own electrical resistance will already exceed 0.1Ω (for example, gold-plated phosphor bronze has a resistance of about 0.100), and no matter how high the contact pressure is, However, the tolerance cannot be cleared.

In this embodiment, a movable camera side contact 6a related to the power supply,
6f is the lead wire 21 with low direct electrical resistance,
22 with a conductive adhesive such as solder, the electrical resistance in the conductive paths of the contacts 6a and 6f can be reduced (
This results in a reduction in contact resistance. Although the electrical resistance of the lead wire varies depending on its length and thickness, it can actually be negligibly small by using a lead wire of a certain thickness (for example, φ1 mm).

To explain specifically based on the figures, FIG. 5 shows the front rotation of the camera side contact as seen from the optical axis direction, and
The figure shows a cross section of the main part. Only the camera-side contacts 6a and 6f related to the power source are formed with connecting portions 6a1 and 6f extending in a direction perpendicular to the contact direction. And this connection part 6a.

6f is a notch (groove) 5c formed in the camera side contact base 5
, 5d, so the camera side contact 6a.

6f is prevented from rotating. The lead wire 21 is connected to the connecting portion 6al of the camera-side contact 6a by solder, routed in the direction of the camera-side contact 6f at the opposite end, and fixed by a clamp member 31. Further, the lead wire 22 is connected to the connecting portion 6f of the camera side contact 6f by solder, similarly routed in the direction of the camera side contact 6a at the opposite end, and fixed by a clamp member 32. Note that the other ends of both lead wires 21 and 22 are connected to a predetermined pattern (not shown) on the printed circuit board 8 by solder. Note that the camera side contact 6a.

Since the connecting portions 6a, 6f of 6f are formed closer to the contact point than the printed circuit board 8 in the optical axis direction, the space for connection is provided on the side opposite to the contact point of the printed circuit board 8, that is, further inside the camera body. There is no need to provide one.

The effects obtained by the above configuration are as follows: First, since the coil spring is not used as a conductive path and the lead wire is used as a conductive path, contact resistance can be reduced.

Second, since the connection portion at the contact point is provided closer to the contact point in the optical axis direction than the printed circuit board, no extra space for connection is required. That is, if the contacts are simply connected using lead wires, the easiest thing to come up with is to provide a hole in the printed circuit board 8, form a protruding shaft for connection in the center of the camera side contacts 6a and 6f, and connect the protruding shafts. It has a structure in which the tip of the shaft protrudes from the reading tag to the opposite side of the printed circuit board 8, and is soldered to the lead wire. However, such a structure requires a space inside the camera body (optical device) to route the lead wires and a space for the contacts to protrude, and depending on the structure of the internal mechanism, for example, the focus device, the flange・It becomes necessary to make the back larger. However, as in this embodiment, the lead wire 21.
Camera side contacts 6a and 6f are located on the contact side of the printed circuit board 8 so that the connection of 22 can be made on the contact side in the optical axis direction.
By forming the connecting portion 6a1.6fl in the flange, the flange back is prevented from becoming thicker.

Thirdly, the camera side contacts 6a and 6f to which the lead wires 21.22 are connected are connected to the connection portion 6a1.6fl and the notch 5c.
, 5d, measures are taken to prevent rotation.

This is a normal camera side contact (for example, camera side contact 6b ~
6e) may rotate slightly due to the rotational moment caused by sliding when installing the mount, but rotation of the camera side contact may cause cracks in the solder at the connection point with the lead wire. This can be expected to occur, and for this reason, in this embodiment, the camera-side contacts 6a and 6f are made unrotatable to deal with this problem.

Also, fourthly, the length l of the lead wires 21 and 22 to the fixed position.
Since the lead wires 21 and 22 are routed to the other end so that they are long, the load on the movement of the camera side contacts 6a and 6f in the optical axis direction is reduced.In other words, the lead wires 21 and 22 should not be too thin considering electrical resistance. Therefore, when moving in the optical axis direction when contacting the lens side contacts 14a, 14f, the lead wires 21, 22 are used.
Since the material itself is also slightly deformed, a load occurs during the deformation. This load will affect the movement of the camera-side contacts 6a and 6f, but if the length l to the fixed position is long as in this embodiment, the actual effect will be small. The reason why the wires 21 and 22 are routed toward the opposite end is to increase the length l and to make the contact group block more compact.

Next, the circuit configuration of the interchangeable lens type camera-integrated VTR according to this embodiment will be explained based on FIG.

In FIG. 7, the camera unit C is on the right side, and the lens unit R is on the left side, with the mount part M indicated by the dashed line in the center as a boundary.

The light from the subject 101 is formed by the lens optical system 102 on the imaging surface of the imaging device 103. The subject image is photoelectrically converted by the imaging device 103 and output as an imaging signal, and then processed by the camera signal processing circuit 104. converted to television signal. This television signal is transmitted through an automatic white balance adjustment circuit (hereinafter referred to as AWB circuit) 114. Automatic focus adjustment circuit (hereinafter referred to as AF circuit) 115. The light is supplied to various automatic adjustment circuits such as an automatic exposure control circuit (hereinafter referred to as AE circuit) 116, and various adjustment operations are performed.

These AWB circuits 114. AF circuit 115. A.E.
Each control signal is output from various automatic adjustment circuits such as the circuit 116, and is supplied to each controlled object. A control signal output from the AWB circuit that adjusts color balance in camera signal processing is input to the camera signal processing circuit 104,
AF circuit 115. Control signals CI and C2 output from the AE circuit 116 are input to the camera-side microcomputer 119.

Also, a zoom switch 117 for setting the focal length of the optical system.
The control signal C3 generated by is also input to the camera-side microcomputer 119.

These control signals and the like are transmitted as communication data from the camera unit C side to the lens unit R side via a data communication path 126 formed by a group of electrical contacts arranged on the aforementioned mount.

The data communication path 126 is connected to the lens side microcomputer 1
20, and all communication data is received by the lens-side microcomputer 120.

Various control signals CI, C2, and C3 input to the camera-side microcomputer 119 are transmitted to the lens-side microcomputer 120 via the data communication path 126 (the above-mentioned contacts 6b to 6e, 14b to 14e), and are sent to each control target. Adapted control variables C1', C2', C3'
is converted to And each control amount CI', C2'
, C3' is the AF driver circuit 127. AE driver circuit 126. is supplied to zoom driver circuit 125, and each actuator 128. 129.
130 respectively control the optical system 102.

In addition, an encoder 131. 132. 133 is provided.

It has an encoder 131 for detecting the focal position, an encoder 132 for detecting the aperture state, and an encoder 133 for detecting focal length information by zoom operation, and each detected information is sent to the lens-side microcomputer 120. Information from these encoders is used for lens-side control, and is also transmitted to the camera-side microcomputer 119 as needed, and used for processing such as AF and AE on the camera side.

Next, the circuit operation of FIG. 7 will be explained using the flowchart of FIG. 8.

That is, when the power of the camera is turned on (step 1), the camera-side microcomputer 119 confirms that the lens is attached (step 2), and sends a request to send the initial data of the lens via the data communication path 126 (step 2).
3).

After that, the lens side will receive various initial data including the lens type (5step 4), and the camera side will:
The above various data 01 is stored in the camera side microcomputer.
~ C3 etc. are read (step 5), this is parallel-serial converted (step 6), and the L/data CTL is transmitted to the lens side (step 7).

Also, receive various data LTC including detection information of each encoder from the lens side (step 8), and perform various controls while outputting the encoder data (s
step9). After that, if the lens is attached, check whether the camera power is on, and if it is on, wait until one field period has elapsed and return to the data Cl-C5 reading step (step.

5 step 12). Note that this routine ends when the lens is removed or the camera power is turned off.

On the other hand, on the lens side, attach the lens (step ') L
/After receiving the initial value request CTL from the camera (ste
p2') Then, the initial value of the lens is transmitted as LTC (step 3'). At this time, the initial value is read out from a ROM or the like connected to the lens-side microcomputer 119, subjected to parallel-to-serial conversion, and transmitted.

In addition, each encoder 127°1 detects the state of the lens.
The detected information such as 28 and 129 is read into the lens-side microcomputer (step 4'), and parallel-to-serial conversion is performed (step 5').

Furthermore, data CTL is received (step 6') L/, then data LTC (s'tep 7') is transmitted, and further 5
Data 01~ prepared in step4'5tep5'
Various information such as C3 is output (step 8'). Then, if the lens unit is still attached and the camera power is on, wait one field period and read the encoder detection data again (steps 9' and 5).
tep10', 5tepH'). Note that this routine ends when the lens is removed or the camera power is turned off.

As described above, various control information is communicated between the camera unit and the lens unit, and each part is thereby controlled.

For example, the AF control signal CI' is output to the drive circuit 127. The AF actuator 128 is connected to the drive circuit 127.
The optical system 102 is controlled according to the output of the optical system 102, and its position is adjusted so that a focused state is obtained.

Further, for example, the AE control signal C2' is output to the driver 126. The AE actuator 129 controls the optical system 102 according to the output of the driver 126, and adjusts the aperture value to the optimum value.

Further, for example, the zoom control signal C3' is transmitted to the driver 125.
Output to. The zoom actuator 130 controls the optical system 102 according to the output of the driver 125, and adjusts the focal length to the specified focal length.

[Modified example of the embodiment]

In the embodiment described above, the contacts 6a and 6f are related to the power supply.

14a and 14f are arranged at both ends of all the contacts, but even if two or three spare contacts or communication contacts are arranged further to the left of the -left contacts 6a and 14a (in Fig. 4), The effects of the present invention can be obtained,
Included in the present invention.

Further, in the above embodiment, the camera side contact 6a related to the power supply
, Only 6F was connected with lead wires 21 and 22, and measures were taken accordingly to prevent rotation, but even if it is a reliable contact point, when connecting with a lead wire, prevent rotation and take measures to prevent rotation. It is effective to take measures such as the connection position and wiring of the

Further, although lead wires were used in the above embodiments, for example, a flexible printed circuit board may be used in place of the printed circuit board 8, an integral strip-shaped portion may be formed, and the land portions of the pattern may be directly connected to the contacts. Also good.

〔Effect of the invention〕

The present invention deals with the use of connecting members such as lead wires in order to reduce the contact resistance of movable contacts, and prevents the movable contacts from separating from the connecting members, makes the contact portion more compact, and allows the movable contacts to move. We provide optical equipment that smoothes the process.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a camera body and an interchangeable lens attached thereto as an embodiment of the present invention. FIG. 2 is a view of the camera body in FIG. 1 viewed from the mount. FIG. 3 is a view of the interchangeable lens in FIG. 1 viewed from the mount. FIGS. 4(a), 4(b), and 4(C) are enlarged cross-sectional views taken along the line A-A of main parts for explaining the mounting rotation of the mount. Figure 5 is a diagram of only the front contact of the camera body viewed from the optical axis direction. FIG. 6 is a sectional view taken along the line B-B in FIG. 5. FIG. 7 is a circuit configuration diagram of a camera system as an example. FIG. 8 is a flowchart showing the operation of the circuit of FIG. 7.

Claims (5)

[Claims] (1) In an optical device having a contact supported movably in the contact direction, the contact is directly connected to a linear or strip-shaped conductive member using an adhesive such as solder to establish continuity with the circuit. . An optical device further characterized in that the contact point is arranged with respect to a support member so as not to be rotatable. (2) In an optical device having a plurality of contact groups supported movably in the contact direction and a plurality of elastic members pressing the contact groups in the contact direction, at least one of the plurality of contact groups One of the plurality of contacts is configured to use the elastic member as a conductive path to establish continuity with the circuit, while at least one of the other contacts is directly soldered to a linear or strip-shaped conductive member. The conductive member and the contact point are connected at approximately the same height in the contact direction as the elastic member, and the conductive member and the contact point are set at approximately the same height in the direction of contact with the conductive member. An optical device characterized in that a contact point is arranged relative to a support member so that it cannot be rotated. (3) Claim (1) or (2), wherein the conductive member is routed toward the end of the support member that has a longer distance so that the length from the connection position with the contact point to the fixed position becomes longer. ) Optical equipment as described. (4) The optical device according to claim (1), (2) or (3), wherein an optical device body such as a camera body is used as the optical device. (5) Claim (1) in which an optical accessory such as an interchangeable lens, an intermediate tube, or an extender is used as the optical device.
), (2) or (3).