# US 2014/0191129 A1 · Fresnel lens and pyroelectricity sensor module including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0191129 A1 - Document ID: US20140191129A1 - Status: Published application - Kind: A1 - Application number: 14/137,166 - Filed: 2013-12-20 - Published: 2014-07-10 - Earliest claimed: 2013-01-04 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Young-ick JANG; Byung-seok SOH; Sang-on CHOI - Web page: https://patentgrep.com/patent/US20140191129A1 ## CPC - G02B 3/08: with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} - G01J 5/0022: {for sensing the radiation of moving bodies} - G01J 5/0806: Focusing or collimating elements, e.g. lenses or concave mirrors - G01J 5/34: using capacitors, e.g. pyroelectric capacitors - G02B 19/0076: {for use with a detector (G02B19/009, G02B19/0095 take precedence)} - G02B 19/009: {for use with infrared radiation} - G08B 13/193: using focusing means - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS ## Abstract A Fresnel lens and a pyroelectricity sensor module are provided. The Fresnel lens includes unit lens groups having different refractive indexes, and each of the unit lens groups includes unit lenses. Between two unit lenses of the same unit lens group at least one unit lens included in a different lens group is arranged. The pyroelectricity sensor module includes a Fresnel lens which condenses infrared light; a detecting sensor disposed to receive the condensed infrared light and detect the infrared light; and a signal processing board on which the detecting sensor is mounted and configured to control an output signal of the detecting sensor. The Fresnel lens includes unit lens groups having different refractive indexes, and each of the unit lens groups includes unit lenses, and between two unit lenses of the same unit lens group, at least one unit lens included in a different lens group is arranged. ## Claims ### Claim 1 A Fresnel lens comprising: a plurality of unit lens groups having different refractive indexes, each of the plurality of unit lens groups including a plurality of unit lenses, wherein between two unit lenses of a same unit lens group, at least one unit lens included in a different lens group is arranged. ### Claim 2 (depends on 1) The Fresnel lens as claimed in claim 1, wherein an arrangement of the plurality of unit lenses is made through repetition of a sequential arrangement of the unit lenses having different refractive indexes. ### Claim 3 (depends on 1) The Fresnel lens as claimed in claim 1, wherein an arrangement of the plurality of unit lenses is made through an irregular arrangement of the unit lenses having different refractive indexes. ### Claim 4 (depends on 1) The Fresnel lens as claimed in claim 1, wherein the plurality of unit lenses extend along a radial direction. ### Claim 5 (depends on 4) The Fresnel lens as claimed in claim 4, wherein each of the unit lenses includes: a body portion configured to form a light incident surface of the Fresnel lens; and a plurality of protrusion portions extending from the body portion and configured to form a light refracting surface of the Fresnel lens. ### Claim 6 (depends on 5) The Fresnel lens as claimed in claim 5, wherein each of the plurality of protrusion portions includes: an extending portion extending from the body portion; and an inclined portion obliquely extending from the extending portion and connected to the body portion. ### Claim 7 (depends on 4) The Fresnel lens as claimed in claim 4, wherein each of the unit lenses is in contact along the radial direction with adjacent unit lenses. ### Claim 8 (depends on 5) The Fresnel lens as claimed in claim 5, wherein the light incident surface has a circular shape or a polygonal shape. ### Claim 9 (depends on 1) The Fresnel lens as claimed in claim 1, wherein the plurality of unit lens groups include a first unit lens group, a second unit lens group, a third unit lens group, and a fourth unit lens group. ### Claim 10 (depends on 5) The Fresnel lens as claimed in claim 5, wherein the plurality of protrusion portions include a first protrusion portion, a second protrusion portion, a third protrusion portion, a fourth protrusion portion, a fifth protrusion portion, and a sixth protrusion portion. ### Claim 11 (depends on 10) The Fresnel lens as claimed in claim 10, wherein the first to sixth protrusion portions of the plurality of the unit lenses form first to sixth light refraction portions of the Fresnel lens, respectively. ### Claim 12 (depends on 5) The Fresnel lens as claimed in claim 5, wherein a width of the body portion is gradually reduced from the circumference of the Fresnel lens toward the center of the Fresnel lens in the radial direction. ### Claim 13 (depends on 12) The Fresnel lens as claimed in claim 12, wherein the width of the body portion at the circumference of the Fresnel lens is at least 20 μm. ### Claim 14 A pyroelectricity sensor module comprising: a Fresnel lens including a plurality of unit lenses, the Fresnel lens configured to condense infrared light; a detecting sensor disposed to receive the infrared light condensed by the Fresnel lens and configured to detect the infrared light; and a signal processing board on which the detecting sensor is mounted and configured to control an output signal of the detecting sensor, wherein the Fresnel lens includes a plurality of unit lens groups having different refractive indexes, and each of the plurality of unit lens groups includes a plurality of unit lenses, and wherein between two unit lenses of a same unit lens group, at least one unit lens included in a different lens group is arranged. ### Claim 15 (depends on 14) The pyroelectricity sensor module as claimed in claim 14, wherein an arrangement of the plurality of unit lenses is made through repetition of a sequential arrangement of the unit lenses having different refractive indexes. ### Claim 16 (depends on 14) The pyroelectricity sensor module as claimed in claim 14, wherein an arrangement of the plurality of unit lenses is made through an irregular arrangement of the unit lenses having different refractive indexes. ### Claim 17 (depends on 14) The pyroelectricity sensor module as claimed in claim 14, wherein the signal processing board is configured to amplify the output signal of the detecting sensor. ### Claim 18 (depends on 14) The pyroelectricity sensor module as claimed in claim 14, wherein the detecting sensor is a pyroelectric infrared ray (PIR) sensor. ### Claim 19 (depends on 1) The Fresnel lens as claimed in claim 1, wherein the plurality of unit lenses are arranged along a circumferential direction of the Fresnel lens, and wherein the at least one unit lens included in the different lens group is arranged between the two unit lenses of the same unit lens group in the circumferential direction. ### Claim 20 (depends on 14) The pyroelectricity sensor module as claimed in claim 14, wherein the plurality of unit lenses are arranged along a circumferential direction of the Fresnel lens, and wherein the at least one unit lens included in the different lens group is arranged between the two unit lenses of the same unit lens group in the circumferential direction.