Browse Prior Art Database

LIGHT REFLECTION ELIMINATION METHOD IN HEAD GIMBAL ASSEMBLY

IP.com Disclosure Number: IPCOM000013074D
Original Publication Date: 2001-Dec-30
Included in the Prior Art Database: 2003-Jun-12
Document File: 3 page(s) / 242K

Publishing Venue

IBM

Abstract

Disclosed is LIGHT REFLECTION ELIMINATION METHOD IN HEAD GIMBALS ASSEMBLY

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LIGHT REFLECTION ELIMINATION METHOD IN HEAD GIMBAL ASSEMBLY

Disclosed is LIGHT REFLECTION ELIMINATION METHOD IN HEAD GIMBALS ASSEMBLY

* Current method

Fig.1 shows the current lighting method for reading the serial number. In Fig.1, the light through both the fiber and the lens is bent with two reflectors(A and B) and illuminates the serial number of the slider. The CCD camera is located in the axis(light axis) shown in Fig.1 and get the image through the two reflectors(A and B) and the lens. However, a strong catoptric light which is bent with the suspension among the light reflected with reflector of A appears in the view as shown in Fig.2 Fig.3 shows this detrimental light reduce slider serial number surface own contrast and this leads to a lower rate in recognition.

located pin

slider

CCD cam era

lens

Fig.1 current optical system

suspension reflector

fiber

light

1

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suspension

45°

45°

Fig2.light bent w ith the suspension Fig3.detrimental light in the view

* Invented method

Fig.4 shows the invented lighting method for reading the serial number. Two reflectors( A and B ) have different angle surface. A has the angle of 40 degrees and B has the angle of 50 degrees. The light reflected by suspension does not return to reflector A but goes to another direction as red dot line shown in Fig.4 T...