We, at Sanyo Electric Co., Ltd., have developed a drive which is resistant to "shock" as a development target function. This is very desirable for portable CD-R/RW drives. So we have developed the world's first Shock Proof technology, "Shock-BP" which resists impact during recording.
With the evolution of "BURN-Proof recording technology", which has been developed in half height drives, we have now added this feature to the portable CD-R/RW drive "CRD-SBP15A".
The sound skip guard function on playback is a necessary feature for portable CD players and MD players.
"Shock-BP" was created by blending the sound skip guard system with the BURN-Proof recording technology, so that recording stops immediately when the drive detects any impact, and it thus enables the drive to restart recording at the stop position after the servo becomes stable. Let's move on to the explanation about "Shock-BP".

During recording to CD-R media, the laser is irradiated on the organic pigment of the record material, and a record mark (pit) is printed at the high temperature of 300 degrees. This laser servo controls the pick up lens so that optimum power is achieved for the record side of the disk.

In 24X speed recording, a precise handling operation is required. A good example would be driving a car on an open highway. What can happen if a sudden side wind blows while the car is moving at a high speed ? it can "jump" to the opposite lane. Similarly, if the CD-R recording encounters any impact, overwriting on the recorded track and doodles on the unrecorded track will occur, causing failure.

And so, Shock-BP always monitors the focus servo and tracking servo and stops the recording when it detects any change in rapid servo condition, then restarts the recording at the stop position after the servo condition is recovered. The portable CD-R/RW drive resistant to "shock" during the recording, is made possible by this "Shock-BP" technology.

*The lens servo to focus this laser output on the record side of the disk is generally called "focus servo". The lens to trace the track engraved on the disk, and the servo to trace are generally called "tracking servo ".
*A shock as discussed here is equivalent to the impact or" shock" when a tennis ball is dropped from a height of 50cm.

We will explain the difference between the sound skip guard system on the playback and the "Shock-BP". In the case of a CD player, ｔhe music data which was read from the disk is stored in memory. After the necessary signal processing is done, it reads the data from the memory by using a high accuracy crystal clock, converts the digital data to analog data, and outputs the music signal.In the 1st developed system, the reading speed of data (revolution speed of a disc) had to be controlled to adjust the value for maintaining proper memory capacity because the memory capacity was limited.

With the development of CD-ROM, the system is equipped with a large memory (buffer memory). The buffer memory enables the system to store large amounts of data from a disc at one time and read the data as needed.
It is the sound skip guard system, the sound output is never disconnected because the buffer memory can store enough data to keep up the sound even though the player is recovering from disorder on the servo.
(This function which is called "Anti-Shock" in common parlance is the technology invented by Sanyo Electric Co., Ltd.)

< Chapter 1 [About the quality of a BURN-Proof's link portion]
< Chapter 2 [Distance to the achievement of zero gap on BURN-Proof]
< Chapter 3 [The birth of CD-R/RW drive which can stand up to a shock]
< Chapter 4 [Evolving BP technology, New standard for high speed recording]