JP2588703Y2 - Data selectable board - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data-selectable board from which each unique value can be selected after assembling a camera system or the like.

[0002]

2. Description of the Related Art Conventionally, a camera system that drives an interchangeable lens from a body side has a unique lens structure stored in a ROM built into the interchangeable lens in order to improve focusing accuracy and shorten focusing time. Is transmitted to the body side CP through a plurality of electrical contacts provided between the body and the interchangeable lens.
Some are configured to be captured as data information for setting an initial value of U.

For example, when one of such information is used to calculate the dead band due to gear backlash when driving the interchangeable lens from the body side, the dead band is corrected by the dead band amount and extra coupling is provided on the interchangeable lens side. There is backlash information that is used to drive and improve focusing accuracy.

[0004] In the case of assembling a plurality of mechanical or optical members into one product such as an interchangeable lens, even if the accuracy of each part is increased, the eigenvalue such as the backlash information is not equal to the dimensional tolerance of the part. Variations occur due to the accumulation.

In order to affect the focusing accuracy and to correspond to such individual eigenvalues dispersed over a wide area, the cumulative tolerance is predicted by the least squares method, and the result is stored in a ROM. Accuracy of most products can be ensured. If the standard deviation is large and the variation is too large, the accuracy can be ensured in accordance with the actual measurement value for each product after the completion of the assembly by analog adjustment using a variable resistor or the like.

[0006]

However, when the data to be stored in the ROM is determined in advance by the least square method as described above, if the predicted accumulated tolerance deviates greatly from the approximate calculation result, the focusing accuracy becomes poor. turn into.

Further, when adjusting the variable resistance or the like to match the measured value, although the data accuracy can be ensured, the number of variable resistance parts and the like and the size of the flexible printed circuit board increase, so that the adjustment work is troublesome. Contrary to labor saving and miniaturization.

The present invention has been made in view of such a problem, and in order to secure focusing accuracy and the like, data stored in a ROM can be set to a value close to an actual measurement value of each lens. It is an object of the present invention to provide a data-selectable substrate which is compatible with miniaturization and miniaturization, and of which cost is almost the same as the conventional one.

[0009]

[0010]

In order to solve the above-mentioned problems, a data-selectable substrate according to the present invention comprises a storage means for storing a plurality of data for correcting a mechanical or optical assembly error; Selecting means for selecting a plurality of data stored in the means, and external setting means connected to the selecting means and externally setting the selecting means by selecting a cutting position, and Or, by optically measuring, by selecting a cutting position of the external setting means, setting the selecting means, from among a plurality of data stored in the storage means, closest to the actually measured value In the data selectable substrate configured to select data, the external setting means is a lead line arranged near a contact portion for electrically connecting a camera body and an interchangeable lens. It can be in.

Further, the data selectable substrate of the present invention is provided.
Are used to compensate for mechanical or optical assembly errors.
Storage means for storing data, and storage means for storing
Selecting means for selecting a plurality of data;
The setting of the selection means is selected by selecting the cutting point.
It has external setting means for externally
Measured mechanically or optically, the external setting means
By setting the selection means by selecting the cutting location
Out of the plurality of data stored in the storage means,
Select the data closest to the measured value
In the data selectable substrate, the cutting portion of the external setting means can be provided at a portion to be attached by an insulating fixing member.

[0012]

In the above arrangement, not only the data necessary for the focus control but only the numerical value obtained by the approximate calculation after sampling is entered, and a numerical value having a plurality of widths centered on the numerical value is stored in the ROM ( Storage means).
And, after the product assembly is finished, we actually measure each product,
The value closest to the actually measured value built in the ROM is changed by cutting the plurality of lead lines (external setting means) to change the flag (selection means) of the ROM, and the data set for each flag is selected.

That is, a value having a plurality of widths corresponding to the approximate calculated value is set in advance, and after the product assembly is completed, a value including an assembly error and a component tolerance is actually measured, and a value closest to the result is selected. To set.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings and the like. FIG. 1 is a development view showing a flexible printed board according to a first embodiment of the present invention. The flexible printed board 1 for the interchangeable lens includes a CP.
U2 is mounted, and the CPU 2 includes a ROM in which unique values of individual interchangeable lenses such as backlash information are written, and a plurality of pins for power supply, data output, and the like. Is connected to a data line.

When the circuit pattern shown in FIG. 1 is formed, the pin P1 is connected to the GND line. This GND line is connected to body side GND and contact 3 (see FIG. 2).
Are set to the same potential, and serve as a reference for L (low level) and H (high level) of each flag. Pins P2 and P3
Are connected to the GND lines by selective disconnection sections A and B, respectively, and the flag in this case is set to (0, 0) by flag selection pins P2 and P3. Here, it is assumed that L is connected to GND, H is inverted, and the flag corresponding to L is 0, and the flag corresponding to H is 1. In addition, only the necessary portions of the circuit pattern are shown, and the rest are omitted.

FIG. 2 is a sectional view showing a state in which the flexible printed board of the first embodiment is incorporated in a lens barrel. The flexible printed board (FPC) 1 is fixed to the support plate of the lens barrel 5 with a double-sided tape or the like.
The output end side 1a (see FIG. 1) is pressed against the contact spring 3 and, when mounted on the body by the bayonet mount 4, energizes the body side contact to exchange data. The selective cutting portions A and B between the pins P2 and P3 and the GND line are disposed near the contact point at the rear end of the lens barrel.

Hereinafter, an embodiment will be described with reference to the case of backlash amount data in order to compensate for a built-in accumulated error after this substrate is built into a lens. In this embodiment, when the two positions of the pins P2 and P3 are represented by binary values for flag identification, (0, 0) (0, 1)
Four types of flags such as (1, 0) and (1, 1) can be set. For example, in the C line shown in FIG.
When the portion is cut off, it is disconnected from GND and pulled up to the H state, so that the pins P2 and P3 are set to the H state. Depending on whether or not to cut in part A and part B,
Four values for the flag can be selected.

FIG. 3 shows gear trains a to d from the coupling to the lens driving gear. The gear a is attached to the other end of the coupling part of the shaft S that transmits the rotational force from the coupling part. Gear b is gear a
And is provided coaxially with the gear c, and the gear a
Is transmitted to the gear c. The gear d is meshed with the gear c, is an internal gear receiving the rotational force from the gear c, and shows only the meshing portion.

All gears adopt JIS class 5,
Gear a has 14 teeth, module 0.3, gear b has 5 teeth
0, module 0.3, gear c has 14 teeth, module 0.3, and gear d has 150 teeth, module 0.3. Also, if the margin between the gear a and the gear b is 0.05 ± 0.03 mm in consideration of the tolerance and the margin between the gear c and the gear d is 0.05 ± 0.03 mm, only the calculation results are shown. By the square method, the backlash amount of the coupling is 13.494 ゜ to 3 in the case of a normal distribution.
It will fall within the range of 1.379% with a probability of 99.7%.

Here, the data to be written to the ROM must be determined, but the intermediate value of the above range 22.43
If 7 ° is taken, an error of 8.942 ° will occur in the worst case.

In the present embodiment, the data corresponding to each flag is 13.5 $, 19.5 $, 25.5 $, 3
1.5 °. At this time, the actual measurement data after product assembly is 2
8 ゜, the closest ROM data is 25.5.
Since ゜, it is sufficient to set the flag (1, 0) corresponding to ゜. The data error at this time is suppressed to 2.5 °, and at worst to 3 °.

FIG. 4 shows a second embodiment.
Only a portion corresponding to the selection unit in FIG. 1 is shown. The fixing by the double-sided tape in the first embodiment is changed to the screw fixing. Instead of cutting the selection part with scissors, the selection part is cut at the same time as the fixing work with the fixing insulating screw. Point A
When screwing at 0, B0, the pin is connected to GND and L
In this state, when screws are screwed at points A1 and B1, the leader line is cut and the state changes to the H state. That is, each flag (0, 0)
The screw fastening points corresponding to (0, 1) (1, 0) (1, 1) are (A0, B0) (A0, B1) (A1, B0)
(A1, B1). Flag (1, 0) in the above example
Is selected, the screw fastening location may be (A1, B0).

As described above, by selecting the flag after assembling, the focusing accuracy is dramatically increased as compared with the case where one approximate calculated value is used as in the related art. In the present embodiment, the case of the FPC on the lens side has been described. However, even in the case of the FPC on the body side, correction of linearity of the photometric element, correction of positional deviation from the actual film surface in the AF photometric element, It can also be applied to the selection of data such as the positional deviation correction.

[0024]

According to the present invention, the data stored in the ROM can be selected after the product is assembled, so that data closer to the actually measured value can be used for each product, and higher precision control can be performed. become.

Further, since the data selecting section is disposed near the rear contact point of the lens, the data selecting operation can be performed in a state close to a completed product without disassembling the product. Further, since a special component for selecting data is not required, it does not lead to an increase in the size of the flexible printed circuit board and an increase in adjustment time, and thus can suppress an increase in cost.

[Brief description of the drawings]

FIG. 1 is a development view showing a flexible printed board according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state of a lens barrel incorporating a flexible printed board according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a backlash amount.

FIG. 4 is a plan view illustrating a data selection unit according to a second embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible printed board 2 Main CPU 3 Contact spring 4 Lens side bayonet P1 GND P2 Flag selection pin P3 Flag selection pin A P2 flag selection part B P3 flag selection part A0, A1, B0, B1 Screw fastening position

Claims (2)

(57) [Scope of request for utility model registration] A storage unit storing a plurality of data for correcting a mechanical or optical assembly error; a selection unit for selecting a plurality of data stored in the storage unit; There is an external setting means for setting the selection means from the outside by selecting a part, and the built-in device is measured mechanically or optically,
By selecting a cutting position of the external setting means, the selecting means is set, and data closest to the actually measured value is selected from among a plurality of data stored in the storage means. The selectable substrate, wherein the external setting means is a lead line arranged near a contact portion for electrically connecting a camera body and an interchangeable lens. 2. A storage unit storing a plurality of data for correcting a mechanical or optical assembly error, a selection unit for selecting a plurality of data stored in the storage unit, and a disconnection unit connected to the selection unit and disconnected. There is an external setting means for setting the selection means from the outside by selecting a part, and the built-in device is measured mechanically or optically,
By selecting a cutting position of the external setting means, the selecting means is set, and data closest to the actually measured value is selected from among a plurality of data stored in the storage means. A selectable substrate, wherein a cut portion of the external setting means is provided at a position where the cut portion is attached by an insulating fixing member.