JPH0520014U - Optical module optical axis adjustment device - Google Patents

Abstract

(57) [Summary] [Objective] The number of man-hours for adjusting the optical axis is reduced by controlling the applied voltage of the piezoelectric element to perform fine movement and clamping for adjusting the optical axis. [Structure] An optical module 6 is held and fixed by a holder 64 by a holder 7 which is a part of an optical axis adjusting device.
The optical fiber 61 has three arms 3 at the end of the metal fitting 62.
Piezoelectric elements 1A, 1 provided at the tips of A, 3B, 3C
It is held by B and 1C. In the optical axis adjustment, first, each applied voltage of these three piezoelectric elements 1A, 1B, 1C is controlled, and the optical fiber 61 is aligned with the optimum position on the optical axis. After this is completed, a voltage is applied to the piezoelectric elements 2A, 2B, 2C to press the support 63 against the upper end surface of the holder 64 and clamp it. Support 63 in this state
Is YAG-welded to the holder 64 and fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical axis adjusting device for an optical module, and more particularly to an optical axis adjusting device for an optical module for coupling a photoelectric conversion element of a light emitting element or a light receiving element and an optical fiber.

[0002]

[Prior Art]

 Conventionally, this type of optical module optical axis adjusting device performs optical axis adjustment for aligning the optical axes of the photoelectric conversion element and the optical fiber, and YAG welding for fixing this positional relationship after the optical axis adjustment. There is. At the stage of this optical axis adjustment, the optical axis adjustment part of the optical module, that is, the optical fiber side is sandwiched by the arm protruding from the fine movement table, and the optical axis is measured by the fine movement table while observing the optical axis measurement device that displays the optical axis deviation. Move the adjustment part and set it to the optimum position. After this optical axis adjustment, clamp the optical axis adjustment unit so that the set position does not shift. Next, the optical axis adjusting portion is fixed by YAG welding to the body of the optical module, that is, the photoelectric device side. This clamping method is done manually, such as by tightening screws.

[0003]

[Problems to be solved by the device]

 As described above, in the conventional example, since the fine movement adjustment at the optical axis adjustment stage is performed by the mechanical fine movement table, its operation is difficult, and since the clamp is performed by tightening the screw, etc. Is less likely to be applied evenly and axis misalignment is likely to occur. Therefore, there is a problem that it takes a lot of man-hours to adjust the optical axis.

[0004]

[Means for Solving the Problems]

 The optical module optical axis adjusting device of the present invention has three arms arranged so as to butt the ends and sandwiching the optical module at the ends, and an optical axis adjusting portion of the optical module provided at each end of the arms. An optical axis adjusting fine movement part using a piezoelectric element for fine movement, and a fixing part using a piezoelectric element for clamping the optical axis adjustment part provided close to the optical axis adjustment fine movement part. Is equipped with.

[0005]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1A and 1B are a sectional view and a plan view, respectively, showing the structure of the present invention. In FIG. 1 (b), there are three arms 3A, 3B, 3C arranged so as to sandwich the optical module 6, and pressure elements 1A, 1B, 1C are provided at each tip. The optical module 6 is held by sandwiching a terminal fitting 62, which is an optical axis adjusting portion, between the piezoelectric elements 1A, 1B and 1C. The cross-sectional view taken along the line AA of this figure is the cross-sectional view of FIG.

In the optical module 6 shown in FIG. 1A, a photoelectric conversion element 65 is provided in a lower portion of a holder 64 and is optically coupled to an optical fiber 61 in an upper portion. The optical fiber 61 is held by a terminal fitting 62, and the terminal fitting 62 is fixed to a support 63. The support 63 is YAG-welded to a holder 64 after adjusting the optical axis.

The optical module 6 has a holder 64 held and fixed by a holding table 7 which is a part of the optical axis adjusting device. In the optical fiber 61, the portion of the terminal fitting 62 is held by the piezoelectric elements 1A, B, C. The piezoelectric element has a characteristic that its dimension expands and contracts according to the direction of voltage application when a voltage is applied to the electrodes. Therefore, by controlling the voltage applied to each of the three piezoelectric elements 1A, 1B, 1C, the optical fiber The position of 61 can be finely moved in any direction. (The electrodes and wiring for applying the voltage are not shown.) The optical axis adjustment is performed by first controlling the applied voltage of each of the three piezoelectric elements 1A, 1B, 1C to position the optical fiber 61 at the optimum position on the optical axis. To match. After this is completed, a voltage is applied to the piezoelectric elements 2A, 2B, 2C to press the support 63 against the upper end surface of the holder 64, and finally the optical fiber 61 fixed to the support 63 is clamped. In this state, the support 63 is YAG-welded to the holder 64 and fixed. The optical axis adjustment will be completed in the above steps.

[0008]

As described above, according to the present invention, the applied voltage of the piezoelectric element is controlled to perform the fine movement and the clamp for adjusting the optical axis, so that the optical axis can be easily adjusted and the axis can be adjusted by the clamp. There is no shift, and this has the effect of reducing the man-hours for adjusting the optical axis.

[Brief description of drawings]

1A and 1B are a sectional view and a plan view, respectively, showing the structure of the present invention.

[Explanation of symbols]

 1A, 1B, 1C Piezoelectric element (for optical axis adjustment) 2A, 2B, 2C Piezoelectric element (for clamping) 3A, 3B, 3C Arm 6 Optical module 7 Holding base

Claims (1)

[Scope of utility model registration request] 1. A three-arm arm arranged so as to butt the ends and sandwiching an optical module at the ends, and a piezoelectric element provided at each of the ends of the arms for finely sandwiching an optical axis adjusting portion of the optical module. And a fixing portion using a piezoelectric element for clamping the optical axis adjusting portion, which is provided close to the optical axis adjusting fine moving portion. Optical module optical axis adjustment device.