HUL7001 Просмотр технического описания (PDF) - Panasonic Corporation

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HUL7001

Hologram Unit

Panasonic Corporation 

HUL7001

Hologram Unit

Important LDHU Usage Information

Panasonic’s laser detector hologram unit (LDHU)

has features of using a plastic package, and of inte-

grating a low-current-operating, high-efficiency la-

ser and a photodetector in order to reduce the size

and weight of the optical pickup.

Please follow the instructions presented below to

take advantage of this feature and ensure that the

pickup is highly reliable.

1. Static Electricity

The semiconductor laser used in the LDHU is char-

acteristically, especially sensitive to static electric-

ity, in semiconductor devices. Therefore care must

be taken in handling the semiconductor laser. If the

laser receives a pulse which causes light to be emit-

ted in excess of the maximum rating of the laser, the

laser itself could be damaged by the optical energy.

Therefore it is very important to take measures to

protect the LDHU from static electricity and surges

when putting together assembly lines or when han-

dling it during manufacturing processes.

(1) Check all drive circuitry, including the power sup-

ply. Take sufficient preventive measures to en-

sure that, for example, spike currents generated

when the power switch is turned on or off never

exceed the absolute maximum ratings of the

LDHU. Also insert appropriate protective circuits

in the LDHU drive circuitry.

(2) Be careful not to allow static electricity to de-

stroy the LDHU while handling it. Effective mea-

sures for protecting against static electricity in-

clude body grounds (passing through 1MΩ), as

well as conductive mats for the floor, conductive

clothing, conductive shoes, and conductive con-

tainers. The tips of soldering irons must be

grounded. We recommend using ionizers, etc.,

especially around facilities and areas where static

electricity is easily generated.

(3) The laser may also be destroyed by abnormal

pulses from nearby equipment. Therefore fluo-

rescent lights and measuring equipments should

not be turned on or off near the laser.

2. LDHU Heat-Release Design

The semiconductor laser, which is the light emit-

ting device, naturally has a limited service life. This

service life is shortened as the temperature is in-

creased. Therefore the design should include suit-

able heat-releasing measures. Heat release from the

lead frame and the back of the package must be in-

corporated into the design in order to improve heat-

releasing capabilities. For assistance in evaluating

heat-releasing capabilities (thermal resistance), please

contact us.

3. Storing LDHU Units After Removal from Alumi-

num-Laminated Bags

If supplies are stored prior to mounting for ex-

tended periods of time in a high-humidity environ-

ment, subsequent heating during solder mounting will

cause moisture in the parts to vaporize. This may

cause problems related to part characteristics.

In order to prevent moisture absorption, LDHU

units are packaged in moistureproof aluminum-lami-

nated bags which are sealed together with silica gel

before shipping. After LDHU units are removed from

these moistureproof bags, the mounting process

should be completed quickly. Unused LDHU units

which have been unsealed and require extended stor-

age should be put back in their aluminum-laminated

bags (along with the silicagel) and resealed.

The recommended environment for LDHU mount-

ing is a temperature range of 5˚C to 35˚C and a rela-

tive humidity range of 45% to75%. (To prevent ex-

cessive humidity and because static electricity oc-

curs more easily if the humidity is too low.)

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