JP2651103B2 - Electro-optic element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-optical element used for a photovoltaic / electric field sensor.

[0002]

2. Description of the Related Art As an electro-optical element, an electro-optical element which is used as a component of an optical voltage / electric field sensor and exhibits an electro-optical effect according to a voltage applied between both electrodes provided on both surfaces thereof, that is, Pockels There are elements. The electro-optical element is used, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-223821 to constitute an optical voltage / electric field sensor.

In recent years, the optical voltage / electric field sensor is manufactured by automatic assembly by a robot or the like as described below. That is, each component constituting the optical voltage / electric field sensor is set on a pallet in a state where an adhesive is applied, and a robot is driven to transfer each component by the robot, and is moved to a predetermined position on the stage. A manufacturing means is employed in which the constituent members are sequentially arranged and assembled at predetermined positions on the arranged substrate, and then the adhesive applied to the constituent members is cured. When such a manufacturing means is adopted, means for connecting lead wires to both electrodes of the electro-optical element before setting on the pallet, and means for connecting both electrodes of the electro-optical element after the assembly as an optical voltage / electric field sensor is completed. There is a means for connecting a lead wire.

[0004]

When a lead wire is connected to an electrode of an electro-optical element, a portion where the lead wire of the electrode is connected rises and becomes non-flat. Therefore, when such an electro-optical element is set on a pallet , the electro-optical element is tilted in either direction based on the horizontal state. Therefore, when the former lead wire connecting means is employed, the electro-optical element is inclined and set to an unstable state on the pallet. When such a set -state electro-optical element is transferred by a robot or the like and assembled on a substrate, the electro-optical element slightly deviates from a set position on the substrate, and the set position is changed. It is not assembled to the correct and set accurate posture. As a result, a deviation of the optical path occurs between the components of the optical voltage / electric field sensor, and the measurement accuracy and the measurement sensitivity are reduced.

[0005] In the case of using the latter lead wire connecting means, the measurement accuracy and the measurement sensitivity are good because the electro-optical element is accurately and accurately mounted at the set position. However, in an electro-optical element, after connecting a lead wire to one electrode on one surface, the substrate must be inverted and a lead wire must be connected to the other electrode on the other surface. Since the operation of connecting the lead wires is increased by one step, the connection work of the lead wires is complicated, the operation time is increased, and the cost is disadvantageous.

Accordingly, it is an object of the present invention to address such problems.

[0007]

SUMMARY OF THE INVENTION The present invention provides an electro-optical element which is used as a component of an optical voltage / electric field sensor and exhibits an electro-optical effect according to a voltage applied between both electrodes provided on both surfaces thereof. , A part of one electrode provided on one surface of the both surfaces is extended to the other surface to be exposed, and lead wires are provided on the other electrode provided on the other surface and the exposed portion of the one electrode. The invention is characterized in that the isoconductive members are electrically connected.

[0008]

In the electro-optical element configured as described above, the connection of the conductive member to each electrode is performed after each constituent member of the optical voltage / electric field sensor is mounted on the substrate. In this case, when assembling, set the electro-optical element on a pallet with the other side facing upward, and take care that the other side of the electro-optical element faces upward on the board after assembly. I do. Accordingly, the other electrode and the exposed portion of the one electrode are present on the upper surface of the electro-optical element, and each conductive member can be easily connected to both of them without inverting the substrate. Further, by employing such connection means, the electro-optical element can be accurately and accurately mounted at a set position on the substrate, and a photovoltage / electric field sensor having high measurement accuracy and measurement sensitivity can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an optical voltage / electric field sensor using a Pockels element which is an electro-optical element according to the present invention. The optical voltage / electric field sensor includes a pair of first and second collimators 12 and 13, a pair of first and second polarizing beam splitters (PBS) 14 and 15, a 波長 wavelength plate 16 on a substrate 11, and the present invention. Is provided.

The PBSs 14 and 15 are adhesively fixed at the right and left sides of the front edge of the substrate 11.
The Pockels element 20 is adhesively fixed at a predetermined distance between the PBSs 14 and 15 in series. Each of the collimators 12 and 13 is connected to each of the PBSs 14 and 1.
5 and is adhesively fixed at a position orthogonal thereto. The optical voltage / electric field sensor having such a configuration is known, except for the configuration of the Pockels element 20, and operates as described below, similarly to the conventional optical voltage / electric field sensor.

That is, in the optical voltage / electric field sensor, light emitted from a light source (not shown) is incident on the first collimator 12 via an optical fiber, collimated by the rod lens of the collimator 12, and collimated by the first PBS 14.
Is incident on. This incident light is converted into linearly polarized light and direction-converted in the first PBS 14 to be converted into a wave plate 1.
6, a 90 ° phase difference is generated between polarization components orthogonal to each other in the wave plate 16, an optical bias is applied, and the light enters the Pockels device 20. This incident light is incident on the second PBS 15 after being subjected to phase modulation according to the voltage to be measured applied by the Pockels element 20, and is converted into a light intensity change proportional to the voltage to be measured in the PBS 15. The light emitted from the second PBS 15 enters the second collimator 13, is condensed by a rod lens of the collimator 13, and is emitted to a light receiver (not shown).

As shown in FIG. 2, the Pockels element 20 has a rectangular element main body 21 having a predetermined thickness, and first and second flat plate-like first and second surfaces on the front and back surfaces at the center of the front end of the element main body 21. Electrodes 22 and 23 are provided. The surface of the element body 21 corresponds to the other surface of the present invention and the first electrode 22
Corresponds to the other electrode, the back surface of the element body 21 corresponds to one surface of the present invention, and the second electrode 23 corresponds to one electrode.

The second electrode 23 is composed of an electrode body 23a and a lead portion 23b narrower than the electrode body 23a. The lead portion 23b extends to the surface through the rear edge of the element body 21 and has a tip portion of the first portion. The electrode 22 is opposed to the electrode 22 at a predetermined interval. Each lead wire 24 a for applying a voltage to the element body 21,
The tip of 24 b is connected to the first electrode 22 and to a portion of the lead 23 b of the second electrode 23 that faces the first electrode 22.

FIG. 3 shows a flowchart of an automatic assembly process of the optical voltage / electric field sensor. In the assembling process, an adhesive is applied to necessary portions of the respective components of the optical voltage / electric field sensor, and the operation is started with the respective components set at predetermined positions on the pallet . First, in step 31, the robot is activated, and in step 32, the substrate 11 is placed on the stage. Then, step 33
Then, the first and second PBSs 14 and 15 are assembled, the wavelength plate 15 is assembled in Step 34, the Pockels element 20 is assembled in Step 35, and the first and second collimators 12 and 13 are assembled in Step 36. After that, the adhesive applied to each of the components assembled in step 37 is cured, and each component is fixed to the substrate 11. Finally, in step 38, the first electrode 22 located on the surface of the Pockels device 20 and the second electrode 2
No. 3 lead wires 24a, 24
The leading end of b is connected to complete the assembling process.

As described above, in the electro-optical element 20, the lead wires 24a, 24a for the electrodes 22, 23 are provided.
b connects each component of the optical voltage / electric field sensor to the substrate 11
It is done after assembling. In this case, both lead wires 24
a, a first electrode 22 which is a connection portion between
Tip of the lead portion 23b of the electrode 23 was assembled Po
It is located on the surface of the Keckels element 20 . For this reason, when connecting the lead wires 24a and 24b to these two 22 and 23b, the connection can be easily made without inverting the substrate 11. Further, by adopting such connection means, the Pockels element 20 is accurately and accurately mounted at the set position of the substrate 11, and a photovoltage / electric field sensor having high measurement accuracy and measurement sensitivity can be obtained.

It is to be noted that the optical voltage / electric field sensor and the conventional optical voltage / electric field sensor obtained by adopting means for connecting each lead wire to each electrode by inverting the substrate after assembling the constituent members. When the characteristics were compared, they were at the same level of measurement accuracy and measurement sensitivity.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical voltage / electric field sensor configured using a Pockels element according to the present invention.

FIG. 2A is a perspective view of the Pockels element viewed from the front side, and FIG. 2B is a perspective view of the Pockels element viewed from the back side.

FIG. 3 is a flowchart of an automatic assembling process of the optical voltage / electric field sensor.

[Explanation of symbols]

11: substrate, 12, 13: collimator, 14, 15: polarizing beam splitter (PBS), 16: wavelength plate, 20:
Pockels element , 21 element body, 22 first electrode (other electrode), 23 second electrode (one electrode), 23a
Electrode body, 23b ... lead part.

Claims (1)

(57) [Claims] 1. An electro-optical element which is used as a constituent member of an optical voltage / electric field sensor and exerts an electro-optical effect according to a voltage applied between both electrodes provided on both surfaces thereof, wherein one of the two surfaces is provided. A part of the one electrode provided on the other surface is extended and exposed, and a conductive member is electrically connected to the other electrode provided on the other surface and the exposed portion of the one electrode. An electro-optical element comprising: