JPS6214330A - Lens fixing device - Google Patents

Abstract

PURPOSE:To fix a lense to a holder with high adjustment accuracy by providing an adhesive applying hole which is approximately orthogonal to the barrel axis of the lens and passes through approximately the center of two rows of barrel guide projections and another hole which is set approximately parallel with the adhesive applying hole and presses the lens toward the side opposite to the lens barrel. CONSTITUTION:A pressure spring 17 facilitates the easy adjustment by pressing a lens to the two rows of lens barrel guide projections 16 and also holds a adjusted state with the frictional force produced by the pressing force. In this case, the lens 11 is pressed by those projections 16 and therefore kept under an extremely stable state. The adjusted state has no error even though the lens 11 and a holder 12 receive some external force or impact. While the contracting force produced when an adhesive is hardened is set in the same direction as the pressing direction of the spring 17 when the adhesive is poured between the lens 11 under the adjusted state and the holder 12 through an adhesive applying hole. In such a way, the lens 11 is welded to the holder 12 with no control error.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens fixing device used in optical equipment such as compact disc players.

BACKGROUND OF THE INVENTION In recent years, optical equipment such as compact disc players has become rapidly popular, and a device for fixing lenses with high precision is becoming important.

An example of the conventional lens fixing device mentioned above will be described below with reference to the drawings.

FIGS. 2 and 3 are cross-sectional views of a conventional lens fixing device taken in the direction perpendicular to the optical axis and in the direction of the optical axis, respectively. 1
is a lens having a cylindrical lens barrel. 2 is a holder that holds the lens 1, and has a lens barrel insertion hole 3. Pressing hole 4. An adhesive application hole 5 is formed. Reference numeral 6 denotes a pressing spring that presses the lens barrel, and is fixed to the holder 3 with a screw or the like. 7 is a light source such as a semiconductor laser.

The operation of the lens fixing device configured as above will be described below.

Generally, in optical equipment, the light source 7 and lens 1 are moved with high precision in the direction of the arrow X in Fig. 3 in order to direct light onto a recording medium such as an optical disk at right angles, or to focus the light onto the recording medium accurately. Also, adjust the light emitting point of the light source 7 in the Z direction with respect to the optical axis of the lens 1.

Adjustments are often made in the Y direction. Furthermore, it is necessary to fix the lens 1 and the holder 2 with adhesive or the like while maintaining this adjusted state. In order to perform such adjustment and fixing, first, by pressing the lens 1 against the holder 2 with the pressing spring 6, first, the play between the lens barrel of the lens 1 and the lens barrel insertion hole 3 provided in the holder 2 is removed, and the above-mentioned While facilitating adjustment, suppression and
The adjusted state is maintained by the frictional force between the lens 1 and the holder 2 generated by the pressing force of the screws 6. Here, adhesive was injected through the adhesive application hole 5 to fix the lens 1 and holder 2 together.

Problems to be Solved by the Invention However, in the above configuration, the lens barrel insertion hole 3 and the lens barrel of the lens 1 are in line contact, so that the lens 1 and the holder 2
Not only is the adjusted state very likely to go awry when an external force or shock is applied, especially in the direction of the arrow, but also the shrinkage force generated when the adhesive injected from the adhesive application hole 6 hardens acts in the direction of the arrow. There was a problem in that the adjustment state was fixed in an incorrect state.

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention provides a lens fixing device that can fix a lens to a holder without disrupting the adjustment state between the lens and the holder.

Means for Solving the Problems In order to solve the above problems, the lens fixing means of the present invention fixes a lens having a cylindrical barrel with two rows of barrel guide protrusions substantially parallel to the axis of the barrel. An adhesive application hole is formed in the lens insertion hole provided in the holder, and is also approximately perpendicular to the lens barrel axis direction of the lens 1 and passes approximately through the center of the two rows of lens barrel guide protrusions, and an adhesive application hole is formed in the lens insertion hole provided in the holder, and is approximately parallel to this adhesive application hole. The holder is provided with a pressing hole for pressing the lens on the side facing the lens barrel.

Function The present invention uses the above-described configuration to stabilize the support of the lens and holder by the two rows of lens barrel guide protrusions, and also allows the lens pressing force and the curing shrinkage force when the adhesive hardens to be in almost the same direction. , and because this force presses the lens barrel against the lens barrel guide protrusion, the lens and holder can be fixed together without losing their adjusted state.

EXAMPLE Hereinafter, a lens fixing device according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of a lens fixing device in an embodiment of the present invention. In FIG. 1, 11 is a lens having a lens barrel. 12
is a holder that holds the lens 11, and has a lens insertion hole 13.
A press hole 14° and an adhesive application hole 16 are formed. 16
are two rows of lens barrel guide protrusions formed in the lens insertion hole 13, which extend in the axial direction of the lens barrel of the lens 11. Reference numeral 17 denotes a pressing hole for pressing the lens 11 against the holder 12.

The operation of the lens fixing device configured as described above will be explained below.The pressing spring 17 facilitates the adjustment by pressing the lens 11 against the two rows of lens barrel guide protrusions 16, and the pressing force generated by the pressing force. At this time, the lens 11 is pressed against the two rows of lens barrel guide protrusions 16, so it is in a very stable state, and the lens 11 and holder 12 are not subject to any external force or impact. Even if you receive it, the adjustment state will not go out of order. - When adhesive is injected from the adhesive application hole between the lens 11 and the holder 12 in the force adjustment state, the contraction force when the adhesive hardens is in the same direction as the pressing direction of the pressing spring 17, and the lens 11 and holder 12 can be fixed together without losing their adjusted state.

As described above, according to this embodiment, since the lens 11 is pressed and held against the two rows of lens barrel guide protrusions 18 by the pressing spring 17, the adjusted state of the lens 11 and the holder 12 is extremely stable. At the same time, the lens 11 and holder 1 are attached with adhesive.
Since the contraction force when the adhesive and hardening of the lens 11 and the holder 12 act in the same direction as the pressing direction of the pressing spring 17, the lens 11 and the holder 12 can be fixed together without disturbing the adjusted state of the lens 11 and the holder 12.

It can also be provided on the equipment or jig side.

Effects of the Invention As described above, the present invention provides two rows of lens barrel guide protrusions substantially parallel to the lens barrel axis direction in the lens insertion hole provided in the holder, and two rows of lens barrel guide protrusions that are substantially perpendicular to the lens barrel axis direction and By providing the holder with a contact hole passing through approximately the center of the lens barrel guide protrusion in the row, and a press hole substantially parallel to the adhesive application hole and facing the lens barrel, the holder and the lens can be adjusted. It can be fixed without disturbing the condition.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a lens fixing device according to a first embodiment of the present invention, FIG. 2 is a sectional view of a conventional lens fixing device, and FIG. 3 is a sectional view of a conventional lens fixing device viewed from the side. be. 11...Lens having a cylindrical lens barrel, 12.
...Holder, 14...Press hole, 16...
...Adhesive application hole, 16... Lens barrel guide protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3

Claims (1)

[Claims] a lens having a cylindrical lens barrel; a holder having a lens barrel insertion hole provided with two rows of lens barrel guide projections substantially parallel to the axial direction of the lens barrel; Adhesive application holes provided in the holder are perpendicular to each other and pass through approximately the center of the two rows of lens barrel guide protrusions, and a press is also provided in the holder and is substantially parallel to the adhesive application holes and faces the lens barrel. A lens fixing device consisting of a hole.