JPH0364802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line sensor camera that allows a measurement area to be clearly identified.

Generally, when a line sensor with photoelectric elements arranged in a row is used in combination with a lens for precision measurement, it is necessary to clearly identify the measurement area, but since the dimensions of the photoelectric elements are extremely small, ranging from 10 μm to 100 μm, a finder is required. Even with the equipped camera, the measurement range was not very clear.

The present invention eliminates these drawbacks and will be explained below along with examples thereof. FIG. 1 shows the schematic structure of a camera, in which 1 is a lens, 2 is a movable mirror, 3 is a viewfinder glass, 4 is a loubaix, 5 is an observer's eye, and 6 is a line sensor. The light passing through the lens 1 is reflected by the mirror 2 and formed into an image on the viewfinder glass 3.
It is possible to focus the visual field of the lens with the human eye 5 through the lens. This is similar to a general single-lens reflex camera. When the mirror 2 is lifted to the position 2', an image is formed on the line sensor 6, and the line sensor 6 senses the brightness of the image, making it possible to measure it.

Note that the line sensor 6 enables precision measurement, so for example, the pitch is 0.01mm to 0.03mm wide,
It is manufactured with precision of 0.01mm to 0.1mm, and in order to focus, it must be mounted to the camera frame with a positional accuracy of about ±0.01mm.

Next, a description will be given of the installation of the line sensor 6 and the structure of installing the line sensor 6 so that the number of graduations on the viewfinder glass is optically matched.

Figure 2 shows the finder glass 3.
A scale line 8 is engraved on the sand-stamped focusing surface 7. 9 is an arrow indicating the electrical scanning direction, and the measurable range is 0 to 512 for a 512-bit sensor, and 0 to 1024 for a 1024-bit sensor, and the point indicated by the scale line 8 is the measurement position. It shows that.

FIG. 3 is a diagram showing that the sanded surface of the finder glass 3 and the scale lines 8 are on the same plane. In general, the focus surface and the scale plate are separated to avoid carving the scale lines 8 on the sand-stamped surface of the focus surface, but this has a negative effect on focusing accuracy, and the scale lines 8 and 8 are separated. If there is a distance between them, parallax will occur when observed with the eyes 5, and the accuracy of position indication will decrease.

FIG. 4 shows the specific structure of the finder section. When the finder operating rod 10 is pushed, the lever 1
Lever 12 is rotated via lever 1 to rotate reflector 2 in the direction of arrow a and lift reflector 2 to position 2' in FIG. By rotating the operating rod 10, the pin 14 allows the reflecting mirror 2 to be held in a lifted state. The finder glass 3 is fixed by a holding frame 15, and a condenser lens 13 is mounted on it.
is installed.

FIG. 5 shows the specific structure of the attachment portion of the finder glass 3. As shown in FIG. The finder glass 3 is pushed leftward (downward in the drawing) by a push spring 16 and rearward (rightward in the drawing) by a push spring 17. The screws 18 and 19 are attached by a holding frame 15, and in FIG. 5, the screw 18 is configured to slightly move the finder glass in the horizontal direction, and the screw 19 in the vertical direction.

6 and 7 show the structure of the mounting portion of the line sensor 6. FIG. A housing 2 to which a reflector 2, a finder glass 3, and a lens mount 20 are attached.
1, the line sensor mounting part 22 is in an arc-shaped groove 23
It is attached by screws 24 through the . The line sensor 6 is held by an IC socket 26 soldered onto a printed circuit board 25, and is pressed against the mounting member 22 and mounted. The housing 21 is provided with a hole into which the mounting portion 22 is fitted, and the mounting portion 22 is accurately positioned.

With the above structure, the sensor 6 and the viewfinder glass 3 can be easily positioned.

That is, first, the lens back distance, which is the distance from the lens mount surface to the image forming surface, is determined and set so that the lens focuses on both the line sensor surface and the focus surface of the finder glass 3.

Next, attach a lens set to infinity, use a telescope to observe the finder glass 3 through the lens, and mark the scale of the finder glass with the horizontal axis of the cross line, which is the scale line provided within the field of view of the telescope. Align the line with the horizontal axis to establish a horizontal reference within the field of view of the telescope.

Next, raise the mirror 2 to the 2' position, observe the aperture on the sensor surface, loosen the screw 24 so that the horizontal axis of the telescope's crosshairs is parallel to the aperture, and then attach the line sensor. The part 22 is fixed, and the telescope is moved horizontally and vertically with respect to the optical axis so that one end (for example, the left end) of the aperture of the line sensor 6 coincides with the intersection of the vertical and horizontal axes of the telescope's crosshairs. In other words, the aperture should be aligned with the horizontal axis of the crosshairs.

Fix the telescope in this state, observe the focus surface of the finder glass 3 again, and screw the screws 18 and 19.
Correct the position of the finder glass 3 by
Place one end of the scale line 8 of the finder glass 3 at the intersection of the vertical and horizontal axes of the telescope's crosshairs (in this case, the left end)
Match.

By the above procedure, it is possible to optically make the scale line 8 of the finder glass 3 and the aperture of the line sensor 6 completely coincide.

As is clear from the above description, according to the present invention, the aperture of the line sensor and the scale line 8 of the finder are optically matched, so that the measurement by the line sensor camera is very precise and even the measurement of minute objects is possible. There are features that make it possible.

[Brief explanation of drawings]

FIG. 1 is a side view showing a schematic configuration of a camera according to an embodiment of the present invention, FIGS. 2 and 3 are front and side views showing a viewfinder glass and scale lines, and FIG. 4 is a side view of the viewfinder. FIG. 5 is a side view of the attaching part of the finder glass, and FIGS. 6 and 7 are side views of the sensor attaching part. 3... Finder glass, 6... Line sensor, 8... Scale line, 18, 19... Screw, 2
3, 24...groove.

Claims (1)

[Claims] 1 A line sensor that is attached to the housing and detects light incident from the lens using photoelectric elements arranged in a row, and is rotated by operating a control lever to reflect the light incident from the lens toward the line sensor or another direction. A reflector, a finder glass that receives the reflected light from the reflector and has scale lines on the sanded surface of the focusing glass that indicate the length and position of the line sensor; a position adjustment means for adjusting the position by moving on the same plane; and a horizontal adjustment for adjusting the position of the support part that supports the line sensor so that the arrangement direction of the photoelectric elements constituting the line sensor is horizontal. A line sensor camera with means.