JPS62111202A - Production of lens for microminiature solid state camera - Google Patents

Abstract

PURPOSE:To obtain an easily mountable lens at a low cost by dropping a light transmittable resin to the surface of light transmittable glass for sealing a case in which a solid-state image pickup element is built and solidifying the resin. CONSTITUTION:The light transmittable resin 10 dropped onto the glass 20 for sealing the solid-state image pickup element from a needle 11 of a dispenser is cured by the irradiation of UV rays. The dispenser 11 is so designed as to be moved to the upper part of the center of the glass 20 in the stage of dropping the resin. More specifically, the light transmittable resin 10 dropped in a proper amt. from the needle 11 of the dispenser rests at the point where the air an the surface tension and own weight of the glass 20 for sealing are balanced. The light transmittable resin 10 which constitutes a projecting shape having a light condensing characteristic focuses the light onto the image pickup element when the parallel light is irradiated thereto. An optical shutter 12 is opened in this state to irradiate the UV rays to the light transmittable resin 10, thereby curing the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing an optical lens for use in a solid-state camera, and more particularly to a method of manufacturing a lens for an ultra-small solid-state camera.

BACKGROUND OF THE INVENTION In recent years, solid-state cameras, which have excellent characteristics such as high reliability, long life, and low power consumption, have been used in various fields, and are especially used in large numbers as the eyes of various robots and as monitoring sensors. However, with the solid-state cameras used for these purposes6, there are many cases where the resolution does not need to be very high, such as recognizing the presence or absence of an object.For example, when a camera is installed inside a thin door to check whether there are visitors. An example of this is when a camera is attached to the hand of a robot to recognize the presence or absence of objects and the number of objects. In such cases, the solid-state camera must be made thinner and ultra-small in order to fit as much as possible to the target, and each solid-state camera manufacturer is competing with each other.

There are two ways to make solid-state cameras ultra-miniaturized. One is to integrate the electronic components used and make them into ICs (LSIs).
The other is downsizing the optical system and imaging head.
It is the latter that I would like to discuss here.

In the above applications, there is no problem even if the spatial frequency characteristics and various aberrations of the lens are not optimized, so a single lens is sufficient. Therefore, as an ultra-compact imaging head using a lens, one in which the sealing glass of a solid-state imaging device package and an llS lens are integrated has been proposed.

FIGS. 3(a) and 3(b) show configuration diagrams of such examples, and methods for attaching the lenses will be explained. In Figure 3(a), 1
is a single lens that condenses light and forms an image on the image sensor 2. Reference numeral 3 denotes an imaging cord container to which the imaging element 2 is fixed. 4 is an aperture that adjusts the amount of light incident on the image sensor 2. Reference numeral 5 denotes a lens frame to which the single lens 1 is fixed and which is fixed to the imaging cord container 3. In this case, when attaching the lens 1, adhesive was applied to the edge of the lens 1, and the lens 1 was attached to the lens frame 5. Also, Fig. 3(b)
Here, adhesive was applied to the flat surface of the plano-convex lens 22 and fixed to the translucent sealing glass 20, and the translucent sealing glass 20 was attached to the imaging cord container 3.

Problems that the invention aims to solve: However, when attaching the lens, in both cases, the lens was small (lens diameter was about 51111 mm), so it was difficult to handle, and it took a long time to attach it.However, considering the cost of the lens, Since small single lenses are expensive, an inexpensive lens was desired.

In view of the above-mentioned problems, the present invention provides a method for manufacturing an ultra-small solid-state camera lens, which allows manufacturing a lens that is easy to attach at a low cost.

Means for Solving the Problems In order to solve the above-mentioned problems, the method for manufacturing an ultra-small solid-state camera lens of the present invention includes a light-transmitting glass surface that seals a container incorporating a solid-state image sensor. Drop the resin,
It consists of solidifying.

Function: By this method, the lens can be easily attached without handling the lens itself, and only a small amount of resin is needed, so the cost of the lens can be significantly reduced.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a #M manufacturing method for an ultra-small solid-state camera lens according to a first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a translucent resin that is dropped from a needle 11 of a dispenser onto a glass 20 for sealing a solid-state image sensor, and is cured by ultraviolet irradiation. The dispenser 11 can be moved to the upper center of the sealing glass 20 only when dropping the resin. 12 is a light shutter, and 13 is an ultraviolet lamp.

With the above configuration, the translucent tree l1if10 dropped in an appropriate amount from the needle 11 of the dispenser comes to rest at a place where the surface tension of the air and the sealing glass 2G and its own weight are balanced. At this time, when parallel light is irradiated onto the convex light-transmitting resin 10 having light-condensing properties, the parallel light is focused on the image sensor. In this state, the optical shutter 12 is opened and the transparent resin 10 is irradiated with ultraviolet rays to harden it.

If a lens for an ultra-small solid-state image sensor is manufactured using the above method, there is no need to handle the lens itself, the lens can be attached to the front of the image sensor, and the amount of light-transmitting resin dropped is small, so the lens can be easily attached to the front surface of the image sensor. Can be manufactured at low cost.

A second embodiment of the present invention will be described below.

In this case, the method for manufacturing the lens is the same as in the first embodiment, but a part of the glass for sealing the solid B and other elements is processed. FIG. 2 (aHb) shows a state in which a transparent resin is dropped onto the processed sealing glass. Sealing glass 21
is processed so that the center has a cylindrical portion 22.

Therefore, when dropping the translucent resin 10, if the translucent resin 10 is dropped into the surface of the cylindrical part 22, the resin 10 will spread within the cylindrical surface and form a convex lens, allowing the needle of the dispenser to drip accurately. Workability is good as there is no need to adjust the position.

Effects of the Invention As described above, the present invention involves dropping a light-transmitting resin onto the surface of a light-transmitting glass for sealing a container in which a solid-state image sensor is installed, and solidifying the resin to produce an ultra-small solid-state camera lens. Therefore, there is no need to handle the lens itself, and the lens can be manufactured at low cost, which has great practical effects.

4. Detailed explanation of the drawings FIG. 1 is a schematic diagram showing the manufacturing method of a lens for an ultra-small solid-state camera according to the first embodiment of the present invention, and FIG. 2(a)
(b) is a plan view and a side view, respectively, showing a solid-state imaging probe package in which resin is dropped according to the second embodiment of the present invention, and FIGS. 3(a) and 3(b) are an imaging head portion of a conventional solid-state camera. FIG. 1 is a cross-sectional view.

3... Image sensor container, 10... Transparent resin, 11
...Dispenser needle, 12...Light screen ↑I Tsuta-1
13...Ultraviolet lamp, 20.21...Sealing glass (translucent glass), 22...Cylinder section agent Yoshihiro Morimoto in Figure 2 (?
C Gino Figure 3 2σ

Claims (1)

[Claims] 1. A method for manufacturing a lens for an ultra-small solid-state camera, which comprises dropping a light-transmitting resin onto the surface of a light-transmitting glass that seals a container in which a solid-state image sensor is installed and solidifying the resin. 2. Manufacturing a lens for an ultra-small solid-state camera according to claim 1, in which a part of the translucent glass is a cylindrical part, and a translucent resin is dripped onto the end face of the cylindrical part. Method.