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Input Method for Relative Coordinate of Two Dimensions

IP.com Disclosure Number: IPCOM000038571D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 4 page(s) / 61K

Publishing Venue

IBM

Related People

Siio, I: AUTHOR

Abstract

A new input method for the relative coordinate of two dimensions is described. The method utilizes two components: a motion detector which consists of one optical detector and a light source, and a sheet used under the detector. Provided with a modified checkered pattern, as shown in Fig. 1, on the sheet, any motion of the detector on the sheet is detected through reflected light intensity. Such a device is contrasted with a conventional optical mouse, where the sheet has a two- colored pattern, and more than one detector is necessary. In this method only one detector and a sheet of a single plane with a monochrome pattern can be utilized. The input method reported here employs one kind of optical mouse, and requires only one optical detector in the motion detector.

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Input Method for Relative Coordinate of Two Dimensions

A new input method for the relative coordinate of two dimensions is described. The method utilizes two components: a motion detector which consists of one optical detector and a light source, and a sheet used under the detector. Provided with a modified checkered pattern, as shown in Fig. 1, on the sheet, any motion of the detector on the sheet is detected through reflected light intensity. Such a device is contrasted with a conventional optical mouse, where the sheet has a two- colored pattern, and more than one detector is necessary. In this method only one detector and a sheet of a single plane with a monochrome pattern can be utilized. The input method reported here employs one kind of optical mouse, and requires only one optical detector in the motion detector. The value of using a single detector is the reduction in the cost of the optical system and the easier optical adjustment than a conventional optical mouse which has a complex optical system. Another merit of a single detector relates to the size and the shape of the equipment.

A conventional optical mouse has a boxy style because optical detectors should be aligned in a single plane. With a single detector device,

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the size of the equipment can be reduced. For example, a pen style or a fingertip style is possible. As a black and white checkered pattern is printed on the sheet in the present method, the cost for the sheet is lower than a conventional device which uses different colors. As the motion detector required in the present method is identical to the one in the conventional bar-code technique, there is a merit that devices which have been already put to practical use can be adopted. For example, several devices for bar-code readers, such as a reflective sensor, a bar-code wand and a laser detector, are available. The Sheet's Pattern A modified checkered pattern of black and white 10 is printed on the sheet, as shown in Fig. 1. The length of the side of the rectangular area changes periodically with a period of three successive vertical and horizontal areas. When the ratio of the length of the three successive areas is ax:bx:cx for a horizontal direction, and

ay:by:cy for a vertical direction, respectively, the values are determined as follows: ax:bx:cx / ay:by:cy,

AX =/ BX, BX =/ CX, CX =/ AX,

AY = / BY, BY =/ CY AND CY =/ AY. Fig. 1 shows the case of ax:bx:cx=1:3:4, ay:by:cy=1:2:5, and ax=ay. In this case, the resolution power in the x and y directions is the same because the lengths of one period in the x and y directions are equal. The Motion Detector The motion detector consists of one optical detector and a light source. The light source illuminates the checkered pattern on the sheet mentioned above, and the optical detector

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measures the intensity of the reflected light from the sheet. When the measuring point moves on the sheet, the detected light intensity changes with th...