# US 2006/0279867 A1 · Reflection type photoelectric switch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0279867 A1 - Document ID: US20060279867A1 - Status: Published application - Kind: A1 - Application number: 11/452,847 - Filed: 2006-06-14 - Published: 2006-12-14 - Earliest claimed: 2005-06-14 - Assignees: Keyence Corporation - Inventors: Tomoki Deguchi; Katsunari Koyama - Web page: https://patentgrep.com/patent/US20060279867A1 ## CPC - G01V 8/14: using reflectors - G01S 7/4812: {transmitted and received beams following a coaxial path} - G01S 7/4813: {Housing arrangements} - G01S 17/04: Systems determining the presence of a target - G02B 27/283: {used for beam splitting or combining} - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A circuit substrate is divided into a light emitting circuit substrate 60 and a light receiving circuit substrate 70, and they are disposed in a first casing 21 in a two-tier fashion, and the light emitting circuit substrate 60, which is disposed on an upper side, is overlapped with at least a part of an optical system 40. By this means, it is possible to obtain a wider range mounting surface in a small space, and therefore, it is possible to miniaturize a switch main body. In addition, it is possible to miniaturize the switch main body without miniaturizing the optical system 40 more than necessity, simply by changing a disposal configuration of components other than components of the optical system 40 in the switch main body, and therefore, it is possible to prevent lowering of detection accuracy which goes with miniaturization of the optical system 40, and it is possible to detect an object with high accuracy. ## Claims ### Claim 1 A reflection type photoelectric switch comprising: a first casing which has a mounting surface and an opening portion formed so as to face to the mounting surface; a second casing which covers the opening portion of the first casing; an optical system including a light emitting element and a light receiving element, which is disposed in a predetermined area on the mounting surface in the first casing; a light emitting circuit substrate which is disposed in the first casing and has a control circuit of the light emitting element mounted thereon; and a light receiving circuit substrate which is disposed in the first casing and has a control circuit of the light receiving element mounted thereon, wherein one of the light emitting circuit substrate and the light receiving circuit substrate is disposed in an area other than the area on the mounting surface in the first casing in which the optical system is disposed, and the other is disposed so as to be overlapped with at least a part of the optical system, on the opening portion side in the first casing. ### Claim 2 (depends on 1) The reflection type photoelectric switch as set forth in claim 1, wherein the light receiving circuit substrate is disposed in the area other than the area on the mounting surface in the first casing in which the optical system is disposed, and the light emitting circuit substrate is disposed so as to be overlapped with at least the part of the optical system, on the opening portion side in the first casing. ### Claim 3 (depends on 2) The reflection type photoelectric switch as set forth in claim 2, wherein the light emitting circuit substrate has amounting surface formed on only a surface on the opening portion side, and the light receiving circuit substrate has mounting surfaces formed on both surfaces. ### Claim 4 (depends on 3) The reflection type photoelectric switch as set forth in claim 3, further comprising: shield members mounted on the light emitting circuit substrate and the light receiving circuit substrate, respectively. ### Claim 5 (depends on 4) The reflection type photoelectric switch as set forth in claim 4, wherein the light emitting circuit substrate and the light receiving circuit substrate are configured by a hard substrate. ### Claim 6 (depends on 5) The reflection type photoelectric switch as set forth in claim 5, wherein the second casing has a thorough-hole for inserting a fixing tool on the occasion of fixing the reflection type photoelectric switch. ### Claim 7 (depends on 4) The reflection type photoelectric switch as set forth in claim 4, wherein the second casing has a thorough-hole for inserting a fixing tool on the occasion of fixing the reflection type photoelectric switch. ### Claim 8 (depends on 2) The reflection type photoelectric switch as set forth in claim 2, wherein the light emitting circuit substrate and the light receiving circuit substrate are configured by a hard substrate. ### Claim 9 (depends on 8) The reflection type photoelectric switch as set forth in claim 8, wherein the second casing has a thorough-hole for inserting a fixing tool on the occasion of fixing the reflection type photoelectric switch. ### Claim 10 (depends on 2) The reflection type photoelectric switch as set forth in claim 2, wherein the second casing has a thorough-hole for inserting a fixing tool on the occasion of fixing the reflection type photoelectric switch. ### Claim 11 A reflection type photoelectric switch comprising: a first casing which has a mounting surface and an opening portion formed so as to face to the mounting surface; a second casing which covers the opening portion of the first casing; an optical system including a light emitting element and a light receiving element, which is disposed in a first area on the mounting surface in the first casing; a light emitting circuit substrate which is disposed in the first casing and has a control circuit of the light emitting element mounted thereon; and a light receiving circuit substrate which is disposed in the first casing and has a control circuit of the light receiving element mounted thereon, wherein one of the light emitting circuit substrate and the light receiving circuit substrate is disposed in a second area on the mounting surface in the first casing, the second area being different from the first area in which the optical system is disposed, and the other is disposed so as to be overlapped with at least a part of the optical system on the opening portion side in the first casing. ### Claim 12 (depends on 11) The reflection type photoelectric switch as set forth in claim 11, wherein the light receiving circuit substrate is disposed in the second area on the mounting surface, and the light emitting circuit substrate is disposed so as to be overlapped with at least the part of the optical system on the opening portion side in the first casing. ### Claim 13 (depends on 12) The reflection type photoelectric switch as set forth in claim 12, wherein the light emitting circuit substrate has a mounting surface formed on only a surface on the opening portion side, and the light receiving circuit substrate has mounting surfaces formed on both surfaces. ### Claim 14 (depends on 13) The reflection type photoelectric switch as set forth in claim 13, further comprising: shield members mounted on the light emitting circuit substrate and the light receiving circuit substrate, respectively. ### Claim 15 (depends on 14) The reflection type photoelectric switch as set forth in claim 14, wherein the light emitting circuit substrate and the light receiving circuit substrate are configured by a hard substrate. ### Claim 16 (depends on 15) The reflection type photoelectric switch as set forth in claim 15, wherein the second casing has a thorough-hole for inserting a fixing tool on the occasion of fixing the reflection type photoelectric switch.