JP2802126B2 - Displacement meter and method of adjusting position of light receiving unit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light receiving section of a displacement meter, and more particularly to position adjustment thereof.

[Prior Art] A displacement meter emits light from a built-in light receiving element, and irradiates irradiation light to a measured object. Then, the diffuse reflection light from the object to be measured is condensed by a condenser lens, and radiated on the light receiving surface of a position detecting element (hereinafter, referred to as "PSD") as a light receiving element built in the displacement meter to form a light receiving point. Let it. When the measured object moves from a predetermined reference distance, the position of the light receiving point also moves in proportion to the displacement of the measured object (principle of triangulation). The displacement meter is a measuring device that calculates and measures the displacement of the measured object by detecting the irradiation position of the light receiving point on the moved PSD.

The arithmetic circuit that calculates the displacement of the measured object is configured such that the light receiving point on the PSD is located at the center point of the PSD when the measured object is at the reference distance. Therefore,
If the light receiving point when the measured object is at the reference distance is shifted from the center point of the PSD, accurate measurement cannot be performed. Adjustment of the position of the light receiving point on the PSD is performed by moving the PSD. Fine adjustment is required for the position of this PSD.

However, in the mass production process of displacement meters, PS
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.

FIG. 4A, FIG. 4B and FIG.
A description will be given based on FIG. The displacement meter generally includes a housing in which a circuit unit is housed, and a sensor head located on a front surface of the housing. 4A and 4B show only the sensor head. A substrate 6 is fixed to a side surface of the sensor head body 4. And this board 6 and PS
D2 is connected by an electric wire 2b, and PSD2 is stored in the holding member 3.

First, the holding member 3 containing the PSD 2 is mounted on the sensor head body 4. The sensor head body 4 has a fourth
As shown in FIG. B, a through hole 4a is provided, and the light receiving surface 2c of the PSD 2 is attached to the through hole 4a. The lens 11 is a condenser lens. The lens 11 condenses diffusely reflected light from the object to be measured, and irradiates the condensed light on 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 main body 4 with 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. The protrusion 3b has a stop hole 3h, and the screw 8 penetrates the stop hole 3h and is screwed into a screw hole (not shown) provided in the sensor head body 4. As shown in FIG. 4C, the stop hole 3h is provided as a long hole elongated in the direction indicated by the arrow 100. Therefore, when the screw 8 is temporarily fixed to 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, and the light receiving point is positioned at the center of the PSD3. Since the wire 2b has a length that allows the movement of the holding member 3 to be adjusted,
It does not hinder the position adjustment 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 located at the center of the PSD 2, the position of the holding member 3 is manually held. Then, the screw 8 is completely screwed into a screw hole (not shown) provided in the sensor head body 4,
The holding member 3 is fixed so as not to move. Thus, the position adjustment of the holding member of the displacement meter, that is, the position adjustment of the light receiving unit is performed.

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

After the position adjustment of the holding member 3 is performed, when the holding member 3 is fixed to the sensor head main body 4, the holding member 3 receives a rotational force of screwing and shifts in a direction indicated by an arrow 100.
For this reason, it is necessary to perform the position adjustment again, and there is a problem that it takes time for the adjustment work to perform the complete adjustment, and the work efficiency is deteriorated.

In addition, since the wire 2b is provided long in consideration of the movement adjustment of the holding member 3, there is a problem that the influence of noise increases and the reliability of measurement accuracy is impaired.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a displacement meter and a position adjusting method capable of easily and surely adjusting the position of a light receiving section of the displacement meter, and at the same time, have a high reliability. An object of the present invention is to provide a displacement meter having measurement accuracy.

[Means for Solving the Problems] A displacement meter according to claim 1, which is a main body having a through hole, a holding member fixed to the main body, and receives light irradiated through the through hole, In a displacement meter including a holding member including a light receiving element having a light receiving point formed on the light receiving surface, the main body and the holding member include fitting means that can be fitted and slidable with each other. It is attached to the main body by fitting of the combining means, and the holding member is fixed to the main body by a fixing member.

According to a second aspect of the present invention, there is provided the displacement meter according to the first aspect, wherein a wiring board electrically connected to the light receiving element is fixed to the holding member.

A method of adjusting the position of a light receiving section of a displacement meter according to claim 3, wherein the light having a through hole is received by a body having a through hole, and a light receiving point is formed on the light receiving surface. A step of mounting a holding member provided with an element, wherein the step of mounting the holding member on the main body by fitting the slidable fitting means provided on the main body and the holding member to each other, the fitting provided by 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 by the fixing member while holding the holding member at the desired position. It is characterized by having a process.

[Operation] In the displacement meter according to the first aspect and the position adjusting method of the light receiving unit of the displacement meter according to the third aspect, the holding member is moved by sliding the fitting means to be formed on the light receiving surface of the light receiving element. The position of the light receiving point is adjusted to a desired position, and the holding member is fixed to the main body.

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

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

Therefore, a connecting means such as an electric wire for connecting the holding member to the wiring board becomes unnecessary, and the influence of noise can be reduced.

Example An example of the present invention will be described with reference to the drawings. The sensor head main body 4 as the main body shown in FIG. 1 is attached to the front surface of the displacement meter. A through hole 4a is formed in the sensor head main body 4, and the main board 64 is fixed to the sensor head main body 4. First, the PSD 2 is mounted on the holding member 3 and the PSD 2 is fixed by the shield plate 22. The holding member 3 is a member for keeping the insulation between the PSD 2 and the sensor head body 4. Next, the first-stage amplifier 62 is bonded to the back surface of the holding member 3 to which the PSD 2 is fixed. The 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 connected to the terminal lead 24.
Are electrically connected to each other. Thus, first, the holding member 3, the PSD 2, and the first-stage amplifier 62 are integrally formed.

In this embodiment, particularly, only the first-stage amplifier 62 is fixed to the holding member 3. This is because the signal between the PSD 2 and the first-stage amplifier 62 is particularly small, and noise during this period is eliminated as much as possible. Between the first-stage amplifier 62 and the main board 64 connected by the electric wire 2b, the signal is relatively stable and the influence of noise is small. As another embodiment, the main board 64 can also be directly fixed to the holding member to reduce the influence of noise.

The holding member 3 has a convex portion 32, while the sensor head body 4 has a concave portion 34. And the convex part 32 and the concave part
34 is formed as fitting means so as to fit each other. The convex portion 32 is fitted into the concave portion 34, and the holding member 3 is mounted on the sensor head main body 4. The recess 34 is the arrow shown in the figure.
Since the holding member 3 is long in the direction of 200, the mounted holding member 3 can slide in the direction indicated by the arrow 200. Wire 2b connecting first stage amplifier 62 and main board 64
Since the holding member 3 has a slidable length, it does not hinder the movement of the holding member 3.

PSD2 receives the light irradiated through the through hole 4a,
A light receiving point is formed on the light receiving surface. The holding member 3 is slid in the direction shown by the arrow 200 to adjust the light receiving point to be located at the center of the PSD2. The position adjustment of the light receiving point is performed as follows.

The sensor head main body 4 to which the holding member 3 is attached is fixed to a jig shown in FIG. FIG. 2 is a rear view of the sensor head main body 4 fixed to a jig. Note that, in the figure, the first-stage amplifier 62, the electric wire 2b, and the main board 64 are omitted.

The jig shown in FIG. 2 has fixed walls 81 and 82, and a pressing bolt 72 is screwed into a screw hole provided in the fixed wall 82 and penetrates. 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 pressing portion 77 is provided at the tip of the return spring 75.

As shown in FIG. 2, the sensor head body 4 has both ends of the holding member 3 sandwiched between the bolt pressing portion 74 and the spring pressing portion 77, and is fixed to the jig by being pressed.

If the pressing bolt 72 is screwed in, the return spring 75 is compressed with the screwing, and the holding member 3 moves in the arrow 300 direction. If the pressing bolt 72 is loosened, the return spring 74 is extended, and the holding member 3 moves in the direction of arrow 400. In this way, the holding member 3 to which the PSD 2 is fixed is moved to and held at a desired position, and is adjusted so that the light receiving point of the PSD 2 is located at the center of the light receiving surface.

Then, in a state where the holding member 3 is held at a desired position by 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). An adhesive is applied around the end 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 fixing with an adhesive, there is no problem of rotational force due to screwing, and the displacement can be completely prevented.

A screw or the like may be used as the fixing member (not shown). The screw is, for example, a side surface of the holding member 3 shown in FIG.
The holding member 3 is pressed and fixed to the sensor head main body 4 by screwing into the sensor head main body 4 through the sensor head main body 4. Even when a screw is used, the holding member 3 has a convex portion 32 and a concave portion.
Since the position is held and fixed by the jig and the jig, the adjusted position is not shifted by the rotational force at the time of screwing.

In another embodiment, a jig as shown in FIG. 3 can be used for position adjustment. The jig shown is an arm
The arm 154 has an arm pressing portion 15
6 and 158 are provided. Then, the sensor head main body 4 is mounted on the jig such that the side surface of the holding member 3 contacts the arm pressing portions 156 and 158. The arm 154 is screwed into the fixed wall 152 and connected to a pressing bolt 150 penetrating therethrough. As the pressing bolt 150 is screwed in or loosened, the arm 154 moves to the arrow 60.
Move in the direction of 0. In this way, the position of the holding member 3 is moved and adjusted so that the light receiving point on the PSD 2 is located at the center.

Instead of using a jig for position adjustment, the position of the holding member 3 can be adjusted and held manually and fixed to the sensor head body 4. Even when the holding member 3 is manually held, the adjusted position of the holding member 3 does not shift since the protrusion 32 is fitted into the recess 34. in this case,
If an adhesive is used as the fixing member, the rotational force of screwing is not applied, and the displacement can be more completely prevented.

[Effects of the Invention] According to the displacement meter according to the first aspect and the position adjusting method of the light receiving unit of the displacement meter according to the third aspect, the holding member can be easily held at a desired position, and the fixing position of the holding member is It does not slip.

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

In the displacement meter according to the second aspect, connection means such as an electric wire for connecting the holding member and the wiring board is not required, and the influence of noise can be reduced.

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

[Brief description of the drawings]

FIG. 1 is a perspective view showing a light receiving portion position adjusting mechanism of a sensor head of a displacement meter according to one embodiment of the present invention. FIG. 2 is a jig for a sensor head of the displacement meter according to one embodiment of the present invention. FIG. 3 is a rear view showing a state in which the sensor head of the displacement meter according to one embodiment of the present invention is fixed to another jig, and FIG. FIG. 4B is a partial cross-sectional view showing a state in which the light receiving unit is mounted on the sensor head of the displacement meter shown in FIG. 4A, and FIG. It is a rear view of the holding member of the sensor head of the displacement meter of FIG. 2 ... PSD 3 ... Holding member 4 ... Sensor head body 32 ... Protrusion 34 ... Recess 62 ... First stage amplifier 64 ... Main board

Continuation of the front page (56) References JP-A-63-249094 (JP, A) JP-A-50-107945 (JP, A) JP-A-59-73722 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G12B 5/00 G01C 3/00

Claims (3)

(57) [Claims] 1. A main body having a through hole, a holding member fixed to the main body, the light receiving element receiving light irradiated through the through hole and forming a light receiving point on a light receiving surface thereof. Wherein the main body and the holding member are provided with fitting means that can be fitted and slidable with each other, and the holding member is attached to the main body by fitting of the fitting means; The displacement meter, wherein the holding member 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 mounting, on a main body having a through hole, a holding member having a light receiving element for receiving light irradiated through the through hole and forming a light receiving point on a light receiving surface thereof. Attaching the holding member to the main body by fitting the slidable fitting means of the main body and the holding member to each other, and sliding the fitting means of the main body and the holding member to set the mounting position of the holding member. A step of adjusting the position of the light receiving point to a desired position by moving, and a step of 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 of the meter.