JPH03197896A - Displacement gauge and position adjusting method for its photodetection part - Google Patents

Abstract

PURPOSE:To easily and securely adjust the position of the photodetection part of the displacement gauge and to improve the measurement accuracy by fixing a holding member which is mounted on a main body by the fitting of fitting means to the main body by a fixing member. CONSTITUTION:The holding member 3 has a projection part 32 and the sensor head main body 4 is equipped with a recessed part 34. Then the projection part 32 and recessed part 34 are so formed as to engage each other as the fitting means. The projection part 32 is fitted in the recessed part 34 to mount the holding part 3 on the sensor head main body 4. The sensor head main body 4 is fixed to a jig by clamping both ends of the holding member 3 with a bolt pressing part and a spring pressing part and pressing them. The holding member 3 can easily be held at a desired position and never shifts in fixation position. Consequently, the position of the photodetection part of the displacement gauge can easily and securely be adjusted and the measurement accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a light receiving section of a displacement meter, and particularly to position adjustment thereof.

[Prior Art] A displacement meter emits light from a built-in light emitting element and irradiates an object to be measured with irradiation light. Then, the diffusely reflected light from the object to be measured is focused by a condenser lens, and is irradiated onto the light-receiving surface of a position detection element (hereinafter referred to as rPSDJ) as a light-receiving element built into the displacement meter to form a light-receiving point. When the object to be measured moves from a predetermined reference distance, the position of this light receiving point also moves in proportion to the displacement of the object to be measured (principle of triangulation).

The displacement meter is a measuring device that calculates and measures the displacement of the object to be measured by detecting the irradiation position of the light receiving point on the moved PSD.

The calculation circuit that calculates the displacement of the object to be measured is such that when the object to be measured is placed at the reference distance, the light receiving point on the PSD is
It is configured to be located at the center point of D. Therefore, when the object to be measured is at the reference distance, the light receiving point is PS
If the position is shifted from the center point of D, accurate measurement cannot be performed. To adjust the position of the light receiving point on the PSD, use the PS
This is done by moving D. Fine adjustment is required for the position of this PSD.

However, in the mass production process of displacement meters, the PS of all displacement meters is
It is extremely difficult to make the mounting position of D accurate. For this reason, fine adjustment of the mounting position of the PSD is performed manually for each displacement meter.

The position adjustment of the conventional PSD is shown in Fig. 4 A1 Fig. 4 B and Fig. 4
This will be explained based on Figure C. A displacement meter generally includes a casing in which a circuit section is housed, and a sensor head located on the front of the casing. FIGS. 4A and 4B show only the sensor head portion. A substrate 6 is fixed to the side surface of the sensor head body 4. And this board 6 and P
It is connected to the SD2 by an electric wire 2b, and the PSD2 is housed in the holding member 3.

First, the holding member 3 containing the PSD 2 is attached to the sensor head body 4. The sensor head main body 4 is provided with a through hole 4a as shown in FIG. 4B, and the PS
Mount D2 with the light receiving surface 2c facing the through hole 4a. still,
Lens 11 is a condenser lens. This lens 11 focuses the diffusely reflected light from the object to be measured, and irradiates the focused light onto the light receiving surface 2C of the PSD 2 to form a light receiving point.

Next, the holding member 3 is temporarily fixed to the sensor head body 4 using screws 8 (see FIG. 4A). FIG. 4C shows a rear view of the holding member 3. The holding member 3 has protrusions 3b on both sides.
is provided. And this protrusion 3b eyelet hole 3h
The screw 8 passes through the stopper hole 3h and is screwed into a screw hole (not shown) provided in the sensor head main body 4. As shown in Fig. 4C, the stop hole 3h is marked with an arrow 100.
It is provided as a long slot in the direction indicated by . Therefore,
When the screw 8 is temporarily fixed in a screw hole (not shown) provided in the sensor head main body 4, the holding member 3 can move in the direction indicated by the arrow 100.

Then, the holding member 3 is manually moved in the direction indicated by the arrow 100 to position the light receiving point at the center of the PSD 3. Since the electric wire 2b has a length that allows adjustment of the movement of the holding member 3, it does not become an obstacle to adjusting the position of the holding member 3.

After attaching the holding member 3 to a desired position, that is, a position where the light receiving point is at the center of the PSD 2, the position of the holding member 3 is held manually. Then, tighten the screw 8 into the sensor head body 4.
The holding member 3 is completely screwed into a screw hole (not shown) provided in the holding member 3 to fix it so that it does not move. In this way, the position of the holding member of the displacement meter, that is, the position of the light receiving section is adjusted.

[Problems to be Solved by the Invention] However, the above conventional position adjustment of the light receiving section has the following problems.

After adjusting the position of the holding member 3, when fixing the holding member 3 to the sensor head main body 4, the holding member 3 is subjected to the rotational force of screwing and is displaced in the direction indicated by the arrow 100.

For this reason, it is necessary to perform position adjustment again, and there is a problem in that the adjustment work requires time to perform complete adjustment, resulting in poor work efficiency.

In addition, since the electric wire 2b is provided for a long time in order to adjust the movement of the holding member 3, there is a problem that the influence of noise becomes large and the reliability of measurement accuracy is impaired.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a displacement meter and its position adjustment method that can easily and reliably adjust the position of the light receiving part of the displacement meter. The purpose is to provide a displacement meter with measurement accuracy.

[Means for Solving the Problems] A displacement meter according to a first aspect of the present invention includes a main body having a through hole, a holding member fixed to the main body, and receiving light irradiated through the through hole, In the displacement meter, the main body and the holding member are provided with fitting means that can fit and slide with each other, and the holding member is provided with a holding member that includes a light-receiving element with a light-receiving point formed on its light-receiving surface. It is attached to the main body by fitting the fitting means, and the holding member is fixed to the main body by a fixing member.

The displacement meter according to claim 2 is the displacement meter according to claim 1, comprising:
A feature is that a wiring board electrically connected to the light receiving element is fixed to the holding member.

A method for adjusting the position of a light receiving part of a displacement meter according to claim 3 is a light receiving method in which a main body having a through hole receives light irradiated through the through hole, and a light receiving point is formed on the light receiving surface of the main body. A step of attaching a holding member including an element, the step of attaching the holding member to the main body by fitting together sliding fitting means provided on the main body and the holding member, and a fitting provided on the main body and the holding member. A step of adjusting the position of the light receiving point to a desired position by sliding the means and moving the mounting position of the holding member, and fixing the holding member to the main body with the fixing member while holding the holding member at the desired position. It is characterized by having a process.

[Function] The method for adjusting the position of the light receiving section of the displacement meter according to claim 1 and the displacement meter according to claim 3 is to move the holding member by sliding the fitting means, and to adjust the position of the light receiving section of the displacement meter according to claim 3. Adjust the position of the light receiving point to the desired position and fix the holding member to the main body.

Therefore, it is easy to hold the holding member at a desired position, and the fixed position of the holding member does not shift.

In the displacement meter according to a second aspect of the present invention, a wiring board is fixed to the holding member.

Therefore, there is no need for a connecting means such as an electric wire to connect the holding member and the wiring board, and it is possible to reduce the influence of noise.

[Example] An example of the present invention will be described based on the drawings. A sensor head main body 4 as a main body shown in FIG. 1 is attached to the front part of a displacement meter. Sensor head body 4
A through hole 4a is formed in the main board 64, and the main board 64 is fixed to the sensor head body 4. First, PSD2
is attached to the holding member 3, and the PSD 2 is fixed with the shield plate 22. This holding member 3 is a member for maintaining insulation between the PSD 2 and the sensor head main body 4. Next, the first stage amplifier 62 is glued to the back side of the holding member 3 to which the PSD 2 is fixed. This first stage amplifier 62 is electrically connected to the main board 64 by the electric wire 2b, and the PSD
2 and the first stage amplifier 62 are electrically connected by a terminal lead 24. In this way, first, the holding member 3, the PSD 2
and the first stage amplifier 62 are integrally formed.

In this embodiment, only the first stage amplifier 62 is fixed to the holding member 3. This is to eliminate noise between the PSD 2 and the first stage amplifier 62 as much as possible since the signal is particularly small. The signal between the first □ stage amplifier 62 and the main board 64, which are connected by the electric wire 2b, is relatively stable and the influence of noise is small. As another embodiment, the main board 64 may also be directly fixed to the holding member to further reduce the influence of noise.

The holding member 3 is provided with a convex portion 32, while the sensor head body 4 is provided with a recessed portion 34. The convex portion 32 and the concave portion 34 are formed to fit into each other as a fitting means. The convex portion 32 is fitted into the concave portion 34 to attach the holding member 3 to the sensor head body 4. Since the recess 34 is provided long in the direction of the arrow 200 shown in the figure,
The attached holding member 3 can slide in the direction shown by this arrow 200. First stage amplifier 62 and main board 6
Since the electric wire 2b connecting the holding member 3 has a length that allows the holding member 3 to slide, it does not become an obstacle to the movement of the holding member 3.

The PSD 2 receives the light emitted through the through-hole 4a and forms a light-receiving point on its light-receiving surface. The holding member 3 is slid in the direction indicated by the arrow 200 to adjust the light receiving point to be located at the center of the PSD 2. The position of the light receiving point is adjusted as follows.

The sensor head main body 4 with the holding member 3 attached is moved to the second
Fix it in the jig shown in the figure. FIG. 2 is a rear view of the sensor head main body 4 fixed to a jig.

Note that the first stage amplifier 62, the electric wire 2b, and the main board 64 are omitted in the figure.

The jig shown in FIG. 2 is equipped with fixed walls 81 and 82, and a press bolt 72 is screwed into and passes through a screw hole provided in the fixed wall 82. A bolt pressing portion 74 is provided at the tip of the pressing bolt 72. On the other hand, the fixed wall 81 has a return spring 75 at a position facing the pressing bolt 72, and a spring suppressing portion 77 is provided at the tip of the return spring 75.

As shown in FIG.
It is fixed to the jig by being sandwiched and pressed.

When the pressing bolt 72 is screwed in, the return spring 75 is compressed and the holding member 3 moves in the direction of the arrow 300. Furthermore, when the pressing bolt 72 is loosened, the return spring 75 is expanded and the holding member 3 is moved in the direction indicated by the arrow 400.
move in the direction. In this way, the holding member 3 to which the PSD 2 is fixed is moved and held at a desired position, and the light receiving point of the PSD 2 is adjusted so as to be located at the center of the light receiving surface.

Then, while holding the holding member 3 at a desired position with the jig shown in FIG. 2, the holding member 3 is fixed to the sensor head main body 4 by a fixing member. An adhesive or the like is used as the fixing member (not shown). The adhesive is applied around the end portion 39 of the holding member 3 shown in FIG. 1, for example, to fix the holding member 3 to the sensor head body 4. When fixed with adhesive, there is no problem of rotational force caused by screwing, and positional displacement is completely prevented.

A screw or the like may also be used as the fixing member (not shown). For example, the screw can be attached to the side surface 3 of the holding member 3 shown in FIG.
8 and screws into the sensor head main body 4 to press the holding member 3 and fix it to the sensor head main body 4. Even when screws are used, the position of the holding member 3 is held and fixed by the convex portion 32, the concave portion 34, and the jig, so that the adjusted position will not shift due to the rotational force when screwing.

Further, as another embodiment, a jig as shown in FIG. 3 may be used for position adjustment. The jig shown in the figure is arm 1
54, and arm pressing parts 156 and 158 are provided at the tip of the arm 154.

Then, the side surfaces of the holding member 3 are attached to the arm pressing parts 156 and 1.
The sensor head main body 4 is mounted on the jig so as to be in contact with the contact point 58. The arm 154 is connected to a pressing bolt 150 that screws into and passes through the fixed wall 152. As the pressing bolt 150 is screwed in or loosened, the arm 154 moves in the direction of the arrow 600. In this way, the position of the holding member 3 is moved to adjust the light receiving point on the PSDZ to be located at the center.

It is also possible to manually adjust the position of the holding member 3, hold it, and fix it to the sensor head body 4 without using a jig for position adjustment. Even when holding member 3 is held manually,
Since the holding member 3 is attached with the protrusion 32 fitting into the recess 34, the adjusted position will not shift. in this case,
If an adhesive is used as the fixing member, the rotational force of screwing is not applied, and positional displacement can be more completely prevented.

[Effects of the Invention] The displacement meter according to claim 1 and the method for adjusting the position of the light receiving part of the displacement meter according to claim 3, the holding member can be easily held at a desired position, and the fixed position of the holding member is fixed. Stays in place.

Therefore, the position of the light receiving section of the displacement meter can be easily and reliably adjusted, and work efficiency can be improved.

The displacement meter according to the second aspect eliminates the need for a connecting means such as an electric wire for connecting the holding member and the wiring board, and it is possible to reduce the influence of noise.

Therefore, it is possible to provide a displacement meter with reliable measurement accuracy.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a light receiving part position adjustment mechanism of a sensor head of a displacement meter according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a sensor head of a displacement meter according to an embodiment of the present invention. 3 is a rear view showing a state in which the sensor head of a displacement meter according to an embodiment of the present invention is fixed to another jig, and FIG. FIG. 4B is a partial cross-sectional view showing the light receiving section attached to the sensor head of the displacement meter, and FIG. 4C is a side view showing the light receiving section of the sensor head of the displacement meter. FIG. 3 is a rear view of the holding member of the sensor head of the displacement meter. 34... Concavity 62... First stage amplifier 64... Main board 2 ・ ・ ・ - PSD 3... Holding member 4... Sensor head body 32... ... Convex part 2 Figure Figure Figure Figure Figure

Claims (3)

[Claims] (1) A main body having a through hole, a holding member fixed to the main body, comprising a light-receiving element that receives light irradiated through the through-hole and forms a light-receiving point on its light-receiving surface. A displacement meter comprising a holding member, wherein the main body and the holding member are provided with fitting means that can fit and slide with each other, the holding member is attached to the main body by fitting the fitting means, and the holding member A displacement meter characterized in that the is fixed to the main body by a fixing member. (2) The displacement meter according to claim 1, wherein a wiring board electrically connected to the light receiving element is fixed to the holding member. (3) A step of attaching to the main body having a through-hole a holding member including a light-receiving element that receives light irradiated through the through-hole and forms a light-receiving point on its light-receiving surface, attaching the holding member to the main body by fitting the sliding fitting means provided on the main body and the holding member into each other; sliding the fitting means provided on the main body and the holding member to move the mounting position of the holding member; A displacement meter characterized by comprising the steps of adjusting the position of the light receiving point to a desired position by adjusting the position of the light receiving point to a desired position, and fixing the holding member to the main body by a fixing member while holding the holding member at the desired position. How to adjust the position of the light receiving part.