JPH09259248A - Skin surface pattern input device and optical surface mounting method for transparent elastic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily replace a transparent elastic film and to improve the contrast of an image by bringing silicone rubber, etc., into direct contact with the optical surface of a prism. SOLUTION: The silicone rubber 8 is mounted on the optical surface 2 of the prism 1. This silicone rubber 8 is transparent, elastic and permeable to air. The size of this silicone rubber 8 corresponds to the size of the optical surface of the prism 1 and this silicone rubber 8 is mounted on the optical surface 2 when used. If there is an air bubble between the optical surface 2 and silicone rubber 8, is transmitted to exit by applying pressure (pressing) the part of the silicon rubber 8 lifted by the air bubble with the hand from above. This silicone rubber 8 is replaceable, liquid which is easy to vaporize is dropped on the optical surface 2, and the silicone rubber 8 is pressed from above the liquid and brought into contact with the optical surface 2. At this time, if an air bubble is present in the liquid layer, the air bubble is removed by pressing the hand from above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin surface pattern input device for pressing a finger or a palm and a mounting method.

[0002]

2. Description of the Related Art FIG. 6 shows the configuration of a conventional skin surface pattern input device. This input device includes a prism 1 having a triangular vertical section, and presses a finger 3, for example, on an optical surface 2 of the prism 1, and a two-dimensional sensor 5 receives light reflected from the optical surface 2 by a light source 4 from below. The reflected light from the optical surface 2 is bright or dark based on the surface pattern of the finger, and the two-dimensional sensor 5 captures the surface pattern image of the finger.

FIG. 7 shows a conventional example in which totally reflected light from the optical surface 2 of the prism 1 is input to the two-dimensional sensor 5. The pressing surface of the finger 3 is composed of a ridge line A, a valley line B, and a boundary line C connecting the ridge line A and the ridge line A. Wake up. Valley line B
At the boundary line C, since it does not contact the optical surface 2, the light ray 7 is totally reflected. The two-dimensional sensor 5 is provided in the direction of this total reflection, and the totally reflected light from the optical surface 2 corresponding to the portion of the valley line B and the boundary line C is input to this two-dimensional sensor 5. On the other hand, a part of the scattered light from the ridge A is input to the two-dimensional sensor 5. Thus, the two-dimensional sensor 5 has a ridge line A, a valley line B,
The reflected image of the boundary is captured. In addition, some of the scattered light
Although the method of inputting to the dimension sensor 5 is adopted, there is also a method of capturing the scattered light itself.

[0004]

In any of the above methods, the contact between the ridge portion of the finger and the optical surface has a great influence on the contrast of the captured image. Especially when the skin surface is dry, good contact cannot be maintained and uneven input occurs. In order to eliminate input unevenness, there is a method of coating the optical surface 2 with a transparent elastic film (for example, silicone). Good coating keeps good contact and eliminates uneven input. However, it has the following points. (1) If the transparent elastic film is peeled off or scratched, it is necessary to recoat the transparent elastic film or replace it with a coated prism. Particularly in the case of prism replacement, in addition to the work of removing the prism, it is necessary to adjust the entire optical system when a new prism is attached. (2) When coating the transparent elastic film, a constant film thickness is required, and the work of making this constant is a very difficult work. Further, if air bubbles enter the boundary surface between the coated transparent elastic film and the optical surface, the surface image will be adversely affected and the image performance will be deteriorated.

It is an object of the present invention to provide an input device and a mounting method capable of enhancing the contrast of an image without coating the optical surface.

[0006]

The present invention includes an optical surface against which the skin surface is pressed, a light source for irradiating the vicinity of the optical surface including the skin surface contact portion, and the contact portion of the optical surface. A two-dimensional sensor that receives reflected or scattered light from the vicinity, and a flexible elastic film is brought into close contact with the optical surface so that the skin surface is pressed through this transparent elastic film. A skin surface pattern input device is disclosed.

Further, the present invention discloses a skin surface pattern input device in which the transparent elastic film has gas permeability.

Further, the present invention discloses a skin surface pattern input device in which the transparent elastic film is made of silicone rubber.

Further, according to the present invention, in a method of attaching a transparent elastic film to an optical surface, the transparent elastic film is brought into close contact with the optical surface. A method for mounting an optical surface of a transparent elastic film of a skin surface pattern input device is disclosed.

Further, the present invention discloses a mounting method wherein the transparent elastic film is made of silicone rubber.

[0011]

FIG. 1 is a diagram showing an embodiment of the present invention. The silicone rubber 8 was placed on the optical surface 2 of the prism 1. Silicone rubber 8 is 0.2mm-5mm
It has a certain degree of thickness, is transparent and elastic, and has the property of allowing gas to permeate. The size (size) of the silicone rubber 8 is equivalent to the optical surface of the prism 1, and is placed on the optical surface 2 when used.

If there are bubbles between the optical surface 1 and the silicone rubber 8, as shown in FIG. 2, pressure is applied to the portion 11 of the silicone rubber 8 lifted by the bubbles from above by a hand or the like ( When pressed down), the bubbles permeate from this part 11 and escape to the outside. The bubbles escape from the portion 11 because the silicone rubber 8 has the property of gas permeation (having microscopic holes for allowing gas to permeate).

The silicone rubber 8 is replaceable. FIG. 3 shows how the silicone rubber 8 is attached during this replacement. A liquid 12 that easily evaporates is dropped on the optical surface 2. The silicone rubber 8 is pressed against the liquid 12 to bring the silicone rubber 8 into close contact with the optical surface 2. If air bubbles 9 are present in the liquid layer 12 in the pressing process, the air bubbles are removed to the outside by pressing them with a hand or the like from above. This is because the bubbles are pushed out toward the end of the optical surface through the fine holes in the silicone rubber 8 film itself ((a) in FIG. 3) and when the silicone rubber 8 is pressed ((b) in FIG. 3). )
And both are done.

As the liquid 12 that easily evaporates, a liquid that evaporates in a few minutes to several hours is preferable to that of a liquid that evaporates instantly. For example, use something like alcohol. The silicone rubber 8 initially contacts the optical surface 2 through the liquid 12, but the liquid 12 adheres to the optical surface 2 as the liquid 12 evaporates through the film itself of the silicone rubber 8. still,
If the silicone rubber 8 is pressed and brought into close contact during the evaporation or at the end of the evaporation, bubbles hardly exist on the contact surface during use.

When the silicone rubber 8 is brought into close contact with the optical surface 2, the silicone rubber 8 may be fitted into a frame and the frame may be placed on the optical surface. An example of this is shown in FIGS. The silicone rubber 8 has a rectangular size slightly larger than the size of the optical surface 2. The longitudinal axis side of the silicone rubber 8 is supported by the frames 20 and 21. For example, frames 20, 21
Has a threaded shape, and the ends of the silicone rubber 8 are sandwiched between the threaded parts and are closed by pins 22 and 23. The framed silicone rubber 8 thus obtained is placed on the optical surface 2 and brought into close contact therewith. In this case, due to the weight of the frames 20 and 21, the silicone rubber 8 is in close contact with the optical surface 2 and sticks to it, and the contact surfaces are stable.

Although the silicone rubber 8 is used as the transparent elastic film in the above, a transparent elastic film made of plastic or a thin film made of plastic may be used. still,
Since the plastic thin film does not have fine holes inside, air bubbles are removed only from the end of the optical surface.

[0017]

According to the present invention, since the transparent elastic film such as silicone rubber is used by directly adhering to the optical surface of the prism, the transparent elastic film can be easily replaced. Further, there is an effect that it is possible to easily prevent the inclusion of bubbles and the like, and the contrast of the image can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of bubble removal in the figure.

FIG. 3 is a diagram showing a procedure for attaching the transparent elastic film 8.

FIG. 4 is a diagram showing another embodiment of the present invention.

FIG. 5 is a diagram showing an example of attachment of FIG.

FIG. 6 is a diagram illustrating a conventional example.

FIG. 7 is a diagram showing an example of a conventional total reflection type.

[Explanation of symbols]

 1 Prism 2 Optical Surface 3 Silicone Rubber as Transparent Elastic Film 9 Bubbles 11 Site 12 Liquid Layer

Claims (5)

[Claims] 1. An optical surface with which the pressed skin surface comes into contact, a light source for irradiating light to the vicinity of the optical surface including the skin surface contact portion, and reflection or scattering from the vicinity of the optical surface including the contact portion. A two-dimensional sensor for receiving light, and a skin surface pattern input device in which a flexible elastic film is closely attached to the optical surface and the skin surface is pressed through the transparent elastic film. . 2. The skin surface pattern input device according to claim 1, wherein the transparent elastic film has gas permeability. 3. The skin surface pattern input device according to claim 1, wherein the transparent elastic film is made of silicone rubber. 4. A method for mounting an optical surface of a transparent elastic film according to claim 1, wherein the transparent elastic film is brought into close contact with the optical surface. A method for mounting an optical surface of a transparent elastic film of a skin surface pattern input device that is closely attached. 5. The mounting method according to claim 4, wherein the transparent elastic film is made of silicone rubber.