JPH0533077Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Technical Field of the Invention) The present invention relates to a digital information reading device such as a camera. (Background of the invention) Conventionally, digital information reading devices such as cameras have often received digital input. If the number of bits used here is a, 2a types of signals can be read, but it is rare that all 2a are used, and in such cases, all 0 bits are read. A pattern can be determined by avoiding all 1 bits. Among these, the common pattern that is at GND potential is inserted into a space that is not used by other bit patterns, so the number of required pattern rows is only a. However, if all 2a patterns are used, when reading all 0 bits, including the common pattern (a
+1) pattern rows are required, which increases the rotation radius of the pattern and brush, which is inconvenient for mounting small devices such as cameras. (Purpose of the invention) The object of the invention is to solve these drawbacks and to make it possible to read 2a types of signals using a number of pattern sequences. (Example) FIG. 1 shows an example of the present invention. This figure is applied to a camera's shutter speed setting dial. 1 is a gray code board, 3 and 4
a, 4b, 4c, and 4d are conductive patterns formed concentrically on the substrate 1, 2 is a brush, and 7 is the upper cover of the camera, with an index 6a on the shutter speed setting dial 6 and a number on the upper cover. You can check the shutter speed. The arm portions 2a, 2b, 2c, 2d, and 2e of the brush 2 are configured to rotate around a shaft 5 while interlocking with a shutter speed setting dial 6 and contacting the pattern with a predetermined contact pressure. Note that the rotating shaft, joint mechanism, etc. are omitted because they are well known. FIG. 2 is a linear development of the Gray code pattern of FIG. 1, and the contact points of the brush 2 are indicated by 2a', 2b', 2c', 2d', and 2e'. 4a, 4
4a, 4b, and 4c are separated into two in the vertical direction in the figure, but they are electrically connected by conductor parts (not shown) and are each independently connected to the arithmetic circuit. There is. 3 is a common pattern inserted into an unused space of each bit string. The position of the brush in the figure indicates the state where all bits are 0. The brushes that come into contact with the left bit row are arranged in two groups, 2a' and 2b', and the bit pattern 4a and brush 2b' are brought into contact with each other, and the common pattern 3 and brush 2a' are brought into contact with each other. Then, a signal with all bits 0 is read. In addition, the arm portion 2a
Since the gap between and 2b can be made relatively narrow (generally about the thickness of the brush plate), the width of the leftmost bit row can be the same or slightly wider than the other three, which saves space. It is advantageous for FIG. 3 shows the positions of the contact points corresponding to each set shutter speed. The white circles indicate the contact points of each brush, and the contact points corresponding to each shutter speed are connected with dash-dot lines. Table 1 shows the status of each bit at each set shutter speed.

[Table] This embodiment employs a Gray code pattern, and uses a signal with all bits 0 at 1/4000 seconds. In this case, the brush contact 2a′ divided into front and rear parts,
The 2a' side of 2b' protrudes forward by one step and contacts the common pattern 3, and the 2b' side contacts the pattern of the bit 4a. Furthermore, by touching the patterns of bits 4b, 4c, and 4d with 2c', 2d', and 2e', respectively, the signal of all bits 0 can be read. Next, in the case of 1/2000 second, 2a', 2
Since b' both touch common pattern 3,
Bit a=1, bit b=0, bit c=0, and bit d=0. Similarly, 16 different signals from 1/4000 second to B (bulb) can be read using four bit strings. In the present invention, the amount of protrusion of the brush contact 2a' is one step, but it can be set to any desired amount by changing the patterns 3 and 4a. Moreover, FIG. 4 shows an application of the present invention to an endless rotary shutter speed setting dial. In the case of pattern B (bulb) in FIG. 3, the bit pattern 4a protrudes by one step, but this can be shared with the bit pattern 4a on the 1/4000 second side. By making the patterns at both ends continuous in this way, endless rotation can be performed without disturbing the order of the Gray code, further improving operability and making effective use of space. The present invention can of course be used for shutter speed setting, ISO sensitivity setting, AE mode setting, photometry mode setting, etc., but it can also be applied to information setting devices other than cameras. In particular, since there are many types of seconds and hours set on the shutter dial, there are about 16 types, so by setting the number of bits a=4, the limited space can be used effectively. (Effect of the invention) With the above configuration, it is possible to read the signal 2a using a bit strings including the common bit string. Therefore, limited space can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a first embodiment of the device according to the present invention, Fig. 2 is a diagram developed on a straight line of the Gray code pattern of Fig. 1, and Fig. 3 is a contact point of the brush at each set shutter speed. and gray code
FIG. 4, which is a diagram showing the relationship with the pattern, is a diagram showing a second embodiment in which the present invention is applied to an endless rotary shutter dial. Explanation of the main part numbers, 1...Gray code board, 2...Brush, 3...Common pattern, 4
...Each bit pattern, 5...Rotation axis, 6...
External operation dial, 7...Top cover.

Claims (1)

[Claims for utility model registration] One bit pattern 4a extending in a specific direction
, a plurality of bit patterns 4b to 4d extending in the same direction in line with the one bit pattern, and one common pattern 3 provided separately from these bit patterns; The contacts 2a to 2 are capable of sliding to the bit pattern or the common pattern, and have the same number of contacts 2a to 2 as the total number of the bit patterns 4a to 4d and the common pattern 3.
The digital information reading device includes a sliding brush 2 having a common pattern 3, and reads digital information from the one bit pattern and the plurality of bit patterns at the stop position of the sliding brush via the sliding brush. is provided in a row in which the one and the plurality of bit patterns are lined up, and is continuously formed on an extension line of the one and the plurality of bit patterns in an unused area of the bit pattern. , so that any one of the plurality of contacts always comes into contact with each other depending on the stop position of the sliding brush; It is composed of a second contact 2a provided close to the second contact 2a and other contacts, and the sliding brush stops at a position where the other contacts contact the plurality of bit patterns. when the first contact is in contact with the one bit pattern and the second contact is in contact with the common pattern located on an extension of the one bit pattern. The second contact is formed so as to protrude in the specific direction from the contact of the second contact, and the common pattern, the one bit pattern, and the plurality of bit patterns are formed by the first, second, and other contacts. What is claimed is: 1. A digital information reading device characterized in that it is possible to connect simultaneously with.