KR20020038041A - Lens assembly for robot eyeball - Google Patents

Abstract

PURPOSE: A lens assembly for a robot eyeball is provided, which controls a focus of an image rapidly according to a distance variation between a lens and a subject. CONSTITUTION: The lens assembly for a robot eyeball includes a lens housing(47) and a main lens(32) installed in the lens housing. A flexible lens(36) is installed in an incident surface of the main lens, and an outer circumference of the flexible lens is expanded and contracted according to an extension of a flexible material in the inside. The flexible material is stored in a reservoir(40). A connection tube(38) connects the reservoir and the flexible lens. A heating cooling part(42) heats or cools the reservoir according to the input of a heating cooling control signal. A distance sensing part(60) outputs a distance sensing signal according to a distance between the subject and the lens. And a control part(70) outputs the heating cooling control signal established in advance according to the input of the distance sensing signal.

Description

Lens assembly for robot eyeball {LENS ASSEMBLY FOR ROBOT EYEBALL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens used in a general robot eye lens, a charge coupled device (CCD), a complementary metal oxide semiconductor (CMOS), etc., and is particularly suitable for rapid reduction and enlargement using a stretched lens. It relates to a robotic eye lens.

1 is a block diagram of a camera lens assembly according to a conventional embodiment. As shown in Fig. 1, a conventional camera lens assembly includes a first lens 8 installed on the subject side in the housing 2 to refracting light from the subject into the housing; A second lens (10) installed behind the first lens (8) for refracting light passing through the first lens (8) out of the housing (2) of the first lens (8); A third lens (12) installed behind the second lens (10) for refracting light passing through the second lens (10) into the housing (2); A fourth lens (14) installed behind the third lens (12) for refracting light passing through the third lens (12) into the housing (2); And an aperture provided in front of the first lens 8 so as to limit the amount of light entering the first to fourth lenses 8, 10, 12, 14 from the subject.

In order to simplify the structure of the product, the diameter of the aperture 6 through which the light of the aperture 4 passes is fixed so as not to be variable, and the aperture 4 is exposed toward the subject of the first lens 8. It is provided in front of the first lens 8 so as to reduce the area of the cut portion.

In addition, the first lens 8 is installed on the object (not shown) in the housing 2 so as to refract light from the subject to the inside of the housing 2, and the second lens 10 It is provided behind the first lens 8 so as to refract the light passing through the first lens 8 to the outside of the housing 2. The third lens 12 is installed behind the second lens 10 so as to refract the light passing through the second lens 10 to the inside of the housing 2, and the fourth lens 14 is made of a third lens. It is provided behind the third lens 12 so as to refract the light passing through the three lenses 12 to the inside of the housing 2.

The first lens 8 is a convex lens having both surfaces convex, the second lens 10 is a concave lens having both surfaces concave, and the third lens 12 is a meniscus lens having a concave surface toward the subject. The four lens 14 is a meniscus lens having a convex surface on the subject side. A meniscus type lens means a lens in which the front and rear surfaces of the lens are oriented in the same direction.

However, the conventional camera lens assembly described above took a long time to adjust the focus according to the distance between the camera and the subject. That is, the conventional camera lens assembly has a problem in that it is not possible to focus on a near or distant subject in a short time, and thus it is impossible to quickly photograph a desired scene.

Accordingly, the present invention has been proposed to solve the above conventional problems, and an object of the present invention is to provide a lens eye lens assembly that can quickly adjust the focus of the image according to the distance between the lens and the subject. have.

In order to achieve the above object, the present invention provides a robot eye lens, the lens housing; A main lens installed inside the lens housing; An extension lens installed at an entrance surface of the main lens and having an outer circumferential surface expanded and expanded according to the degree of expansion of the elastic material therein; A reservoir in which the stretchable material is stored; A connecting pipe connecting the reservoir and the telescopic lens; A heating cooling unit which heats or cools the reservoir according to an input of a hot-cooling control signal; A distance detector for outputting a distance detection signal according to the distance between the subject and the lens; It provides a robot eye lens assembly comprising a control unit for outputting a predetermined hot-cooled control signal according to the input of the distance detection signal.

1 is a block diagram of a conventional robot eye lens assembly,

2 is a block diagram of a robot eye lens assembly according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

32: main lens 34: telescopic lens

38: connector 40: reservoir

42: heating cooling unit 44: aperture

46: entrance lens 47: lens housing

48: exit lens 54: sensor

56: support 60: distance detection unit

70: control unit

Hereinafter, with reference to the accompanying drawings an embodiment according to the present invention, the technical idea of the robot eye lens assembly is as follows.

2 is a block diagram of a robot eye lens assembly according to a preferred embodiment of the present invention. As shown in FIG. 2, the lens assembly for a robot eye according to a preferred embodiment of the present invention includes a lens housing 47, a main lens 32, an expansion lens 36, a reservoir 40, a connection pipe 38, It includes a heating and cooling unit 42, the distance detecting unit 60 and the control unit 70.

The lens housing 47 is a basic frame of the lens assembly for the robot eyeball. The lens housing 47 provides a structure in which the internal parts including the lens can be mounted, and protects the mounted internal parts. The lens housing 47 is preferably configured of a heat insulating material to block heat exchange between the inside and the outside.

The main lens 32 is installed inside the lens housing 47. The main lens 32 has an eyeball shape and refracts the light passing through the expansion lens 36.

The expansion lens 36 is installed on the incident surface of the main lens 32, the outer peripheral surface is expanded and expanded according to the degree of expansion of the expansion material 34 therein. The stretching lens 36 is made of a transparent shape memory material. Therefore, the stretchable lens 36 maintains its initial shape before expansion of the built-in stretchable material 34, and the curvature of the outer peripheral surface increases as the stretchable material 34 expands. Then, the focus is adjusted by changing the curvature of the stretchable lens 36.

The reservoir 40 stores the stretchable material 34. The stretchable material 34 expands or decreases in volume depending on temperature, and uses a transparent material to allow light to pass therethrough. Transparent material may be used as the stretchable material 34.

The connecting pipe 38 becomes a moving path of the stretchable material 34 between the reservoir 40 and the stretchable lens 36. The connecting pipe 38 is configured using a hard material to maintain the original shape without changing the internal volume even when the stretchable material 34 moves.

The heating and cooling unit 42 heats or cools the reservoir 40 according to the input of a hot-cooling control signal. The volume of the stretchable material 34 stored in the reservoir 40 is expanded or reduced in accordance with the heat supply amount of the heating and cooling unit 42. The heating and cooling unit 42 may be a thermoelectric element that emits heat in response to the supply of a driving voltage.

The distance detection unit 60 outputs a distance detection signal according to the distance between the subject and the lens to be photographed. The distance detection signal output from the distance detection unit 60 becomes basic information for adjusting the degree of deformation of the stretchable lens 36.

The control unit 70 outputs a predetermined hot-cooling control signal to the heating cooling unit 42 according to the input of the distance detection signal output from the distance detecting unit 60. The controller 70 performs hot / cold control for each distance to the subject according to a look-up table stored in a memory.

Robot eye lens assembly according to an embodiment of the present invention is the entrance lens 46 installed in the entrance hole of the lens housing 47, the aperture 44 for adjusting the amount of light incident to the main lens 32, A support 56 for fixing the main lens 32 and an exit lens 48 for transmitting the light passing through the main lens 32 to the sensor 54 are additionally installed.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the robot eye lens assembly according to the present invention is capable of quick focusing by automatically changing the curvature of the telescopic lens according to the distance to the subject, there is an effect that can quickly take a high-quality image. .

Claims (4)

In the robot eye lens, A lens housing; A main lens installed inside the lens housing; An extension lens installed at an entrance surface of the main lens and having an outer circumferential surface expanded and expanded according to the degree of expansion of the elastic material therein; A reservoir in which the stretchable material is stored; A connecting pipe connecting the reservoir and the telescopic lens; A heating cooling unit which heats or cools the reservoir according to an input of a hot-cooling control signal; A distance detector for outputting a distance detection signal according to the distance between the subject and the lens; And a controller for outputting a predetermined hot-cooled control signal according to the input of the distance detection signal. The method of claim 1, The telescopic lens is a robot eye lens assembly, characterized in that made of a transparent shape memory material. The method of claim 1, Robotic eye lens assembly, characterized in that the elastic material using a transparent oil. The method of claim 1, The lens housing for the robot eye, characterized in that the lens housing is further provided with an aperture for adjusting the amount of light incident on the main lens.