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Reflective optical encoder package and method

A technology of reflective optics and encoders, applied in the field of optical encoders

Inactive Publication Date: 2010-07-14
AVAGO TECH WIRELESS IP SINGAPORE PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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[0009] The dates of the above patent documents may correspond to any one of the priority date, application date, publication date or grant date

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  • Reflective optical encoder package and method
  • Reflective optical encoder package and method
  • Reflective optical encoder package and method

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Embodiment Construction

[0015] In various embodiments of the invention, wafer-level packaging is employed to provide a glass layer disposed above or below an integrated circuit having photodetectors or light emitters disposed in or on it. Corresponding assemblies, apparatus, systems, and methods are also provided. Various embodiments of the present invention allow for the provision of reflective optical encoder packages with small dimensions.

[0016] Figure 1(a) illustrates a top perspective view of one embodiment of a reflective optical encoder. Figure 1(b) illustrates a side view of the reflective optical encoder package of Figure 1(a). Included in the package 10 of Figures 1(a) and 1(b) is an integrated circuit 20 that includes a photodetector 30 formed on or near a first substantially planar upper surface 50 thereof. Integrated circuit 20 also includes at least one recess 70 formed in or near first surface 50 . The recessed portion 70 is configured to receive light from the light emitter 40 ....

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Abstract

The invention discloses a reflective optical encoder package and its method. Disclosed are various embodiments of a reflective optical encoder package having a light emitter and a light detector disposed on an integrated circuit having an optically transparent glass layer disposed thereover. The package can be manufactured without resort to wirebonding techniques and instead can be made using wafer level packaging methods and materials. The package can also be made of lower profile or smaller footprint than many conventional optical encoder packages, and may be employed to sense or detect rotary or linear motion.

Description

technical field [0001] Various embodiments of the invention described herein relate to the field of optical encoders, and components, apparatus, systems, and methods related thereto. Background technique [0002] Optical encoders are often used as motion detectors in applications such as closed-loop feedback control in motor control systems. Many optical encoders are constructed to convert rotary or linear motion into a two-channel analog or digital output for position encoding using the corresponding disc or tape. See for example the Agilent HEDS-9710, HEDS-9711 lpi analog output small optical encoder module data sheet. And "A miniature Surface Mount Reflective Optical ShaftEncoder" by Krishnan et al., December 1996, Hewlett-Packard Journal, Article 8. [0003] Many conventional transmissive optical encoders include an LED light source or light emitter with a lens and a detector integrated circuit (IC) enclosed in a plastic package. The light from the light source is col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/347
CPCG01D5/34715G01D11/245G01D5/34769
Inventor 王文飞常匡程
Owner AVAGO TECH WIRELESS IP SINGAPORE PTE