CN1329908C

CN1329908C - Method for detecting optical disc and its optical drive

Info

Publication number: CN1329908C
Application number: CNB2003101026640A
Authority: CN
Inventors: 李国骏
Original assignee: BenQ Corp
Current assignee: BenQ Corp
Priority date: 2003-10-28
Filing date: 2003-10-28
Publication date: 2007-08-01
Anticipated expiration: 2023-10-28
Also published as: CN1612248A

Abstract

A method for detecting optical disc is used for optical drive, the optical drive includes spindle motor and optical pick-up head, the method includes, move the optical pick-up head to the first position; emitting first laser light by an optical reading head; judging whether the CD driver is loaded with the read CD or not by the reflection of the first laser, if not, ending the method; moving the optical reading head to a second position; emitting second laser by the optical reading head; and judging the size of the read optical disc by the reflection of the second laser.

Description

Detect the method and the CD-ROM drive thereof of discs

Technical field

The present invention relates to a kind of method and CD-ROM drive thereof that detects discs, particularly relate to a kind of optical read head (Optical Pickup Unit that utilizes; OPU) whether emitted laser has reflection to judge detection discs method and the CD-ROM drive thereof that has or not discs and discs size.

Background technology

Flourish along with the Internet and multimedia industry, replaced cartridge in the past in order to the discs that stores video-audio data, has bigger data storing capacity, and can preserve audio-visual quality better also more of a specified duration, therefore, become the main flow of market Storage Media now, for example: CD-ROM, DVD-ROM and CD-RW discs etc.

General common discs has two kinds of sizes, is respectively the discs of diameter 12CM and diameter 8CM.The discs of diameter 12CM is traditional discs size, can be in order to storing general video-audio data and MP3 data, and the discs of diameter 8CM is more novel discs, mainly is to be used for storing the MP3 data.Aspect mechanism, CD-ROM drive is to be used for the device of access discs data, for example: the CD-ROM drive of personal computer or notebook computer, can be in order to read the discs data, VCD and DVD player are in order to play the discs program, and CD writers then can write down and read the data of discs.

Please refer to Fig. 1, it shows the structural representation of known CD-ROM drive.CD-ROM drive 100 has pallet 110, in order to carrying disc sheet 120, for example: and 12CM discs 120a and 8CM discs 120b, and can withdraw from or put into CD-ROM drive 100 along the direction of arrow among the figure; Spindle Motor (Spindle Motor) 130 is fixed discs 120 after inserting pallet 110 in discs 120, and drives discs 120 rotations.In addition, CD-ROM drive 100 also comprises optical read head 140, in order to reading the stored data of discs 120, and is converted to electrical signal and is sent to circuit board 150.

General CD-ROM drive 100 through be enabled in begin to read discs 120 before, can judge whether be loaded with discs 120 in the pallet 110 earlier, avoiding under the situation that does not have carrying disc sheet 120, read head 140 can be read wrong signal and the operation that produces mistake.When judging that CD-ROM drive 100 is loaded with discs 120, can distinguish it is 12CM discs 120a or 8CM discs 120b again, with the scope that determines that read head 140 moves, and set corresponding parameters.The method of traditional detection discs is to send a control signal by circuit board 150,130 rotations of drive shaft motor, utilize inertia (Inertia) difference of discs 120 itself, size heals big discs 120 more heavily, relatively, it is also slower that Spindle Motor 130 drives the speed that discs 120 are rotated.

Provide Spindle Motor 130 1 fixed ends taken about the point of fixation, in certain rotational time, detect the rotating speed that Spindle Motor 130 is arrived, or measurement Spindle Motor 130 rotates to the required time of certain speed.When rotating speed surpasses first speed, represent and do not have carrying disc sheet 120 in the CD-ROM drive 100, when rotating speed is lower than second speed (second speed is less than first speed), represent carrying 12CM discs 120a in the CD-ROM drive 100, and when rotating speed is between first speed and second speed, then represent carrying 8CM discs 120b in the CD-ROM drive 100.Perhaps, be loaded with 12CM discs 120a when the time above very first time value representation, be loaded with 8CM discs 120b when the time between the very first time and second time representation, do not have carrying disc sheet 120 and ought be lower than second time (second time is less than the very first time) expression CD-ROM drive 100 time.

Yet judge to have or not discs 120 and be 12CM discs 120a or the mode of 8CM discs 120b to have following several shortcoming according to tradition:

1. the mechanical system of utilizing Spindle Motor to rotate to detect discs need spend a certain amount of rotation time, could correctly detect the discs size, is difficult to further shorten detection time.

2. Spindle Motor must clamp discs and could be exactly detects the size that has that it's too late of discs by the rotating speed of Spindle Motor or rotation time, if because the deviation on making makes Spindle Motor can't fix discs, might deposit under the discs situation erroneous judgement for not having, or deposit 12CM discs erroneous judgement and be the 8CM discs, or person 8CM discs is when doing thicklyer, rotate more on the contrary erroneous judgement all cause testing result unreliable for the 12CM discs.

Summary of the invention

In view of this, the purpose of this invention is to provide a kind of method and CD-ROM drive thereof that detects discs, utilize the reflection of read head emitted laser to judge whether CD-ROM drive is loaded with discs, and judgement is loaded with the discs of 12CM or 8CM, spended time is shorter, and can obtain testing result more accurately, cooperate traditional detection method, can judge also whether Spindle Motor fixes discs.

According to purpose of the present invention, propose a kind of CD-ROM drive and comprise: disc bearing district, Spindle Motor, optical read head, and judgment means.The disc bearing district is read discs in order to carrying, and is read discs and can be the first size discs and the second size discs, and wherein the second size discs is greater than the first size discs.Spindle Motor is read discs in order to rotation.Optical read head, in order to reading the discs data, and judgment means is electrically connected on optical read head, is read the discs size in order to judge whether the disc bearing district carries to be read discs and to distinguish.Optical read head is launched first laser in primary importance, judge according to the reflection of first laser whether the disc bearing district carries and be read discs, and after definite disc bearing area carrier discs, optical read head continues to launch second laser in the second place, distinguishes according to the reflection of second laser to be read the discs size.Primary importance and Spindle Motor in the radius of first size CD, and the second place and Spindle Motor apart the radius of first size CD between the radius of the second size CD.Utilize the reflection of laser to detect the discs state, can obtain testing result more accurately fast.

According to purpose of the present invention, a kind of method that detects discs is proposed, be used for CD-ROM drive, be read discs and can be the first size discs and the second size discs, the second size discs is greater than the first size discs, CD-ROM drive comprises optical read head and Spindle Motor, and this method comprises the following steps: optical read head is moved to primary importance; Launch first laser by optical read head;

By the reflection of first laser, judge whether CD-ROM drive is loaded with to be read discs, if CD-ROM drive is not loaded with and is read discs, method ends; Optical read head is moved to the second place; Launch second laser by optical read head; And judge by the reflection of second laser and to be read the discs size.

Primary importance and Spindle Motor are in the radius of first size CD, and the second place and Spindle Motor at a distance of the radius of first size CD between the radius of the second size CD, when the reflection of first laser that optical read head receives surpassed a predetermined value, judgment means judged that the disc bearing area carrier is read discs.When the reflection of second laser that optical read head receives is lower than predetermined value, judgment means judges that being read discs is the first size discs, and optical read head is when receiving the reflection of second laser and surpassing predetermined value, and judgment means judges that then being read discs carries the second size discs.The first size discs is the 8CM discs, and the second size discs is the 12CM discs.Utilize laser detection to be read discs and can obtain judged result more accurately.

According to purpose of the present invention, a kind of method that detects discs is proposed, be used for CD-ROM drive, be read discs and can be the first size discs and the second size discs, the second size discs is greater than the first size discs, and CD-ROM drive comprises optical read head, in order to read the data of discs, and Spindle Motor, in order to the fixed light disc and drive discs rotation, this method comprises the following steps: optical read head is moved to primary importance; Launch first laser by optical read head; By the reflection of first laser, judge whether CD-ROM drive is loaded with to be read discs, if CD-ROM drive is not loaded with and is read discs, method ends; Optical read head is moved to the second place; Launch second laser by optical read head; By the reflection of second laser, judge to be read the discs size; Start Spindle Motor set time of rotation; And rotate the rotating speed of this set time according to Spindle Motor, judge whether be read discs is fixed on the Spindle Motor.Wherein can also start Spindle Motor and turn to a fixed rotating speed, judge according to its required time whether be read discs is fixed on the Spindle Motor again.

When judgement is read discs is the first size discs, and rotating speed judges that being read discs is not fixed on the Spindle Motor during greater than first speed.When judgement is read discs is the second size discs, and rotating speed judges that being read discs is not fixed on the Spindle Motor during greater than second speed, and wherein second speed is less than first speed.The present invention is cooperated traditional detection discs technology, not only can judge to have or not to be read discs and to be read the discs size, and can determine to be read discs and whether be fixed on the Spindle Motor.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.

Description of drawings

Fig. 1 shows the structural representation of known CD-ROM drive;

Fig. 2 A shows according to a preferred embodiment of the present invention CD-ROM structure top view;

Fig. 2 B shows the side-looking structural representation of optical read head detection discs among Fig. 2 A; And

Fig. 3 shows the process flow diagram that detects the discs method according to preferred embodiment of the present invention.

The reference numerals explanation

100,200: CD-ROM drive

110,210: pallet

120: discs

120a, 220a:12CM discs

120b, 220b:8CM discs

130,230: Spindle Motor

140,250: optical read head

150: circuit board

220: be read discs

232: clamping sheet mechanism

252: light emitting module

254: receiver module

260: slide rail

270: judgment means

Embodiment

Characteristics of the present invention are to utilize the optical read head in the CD-ROM drive that discs is launched laser, detect by the reflection of laser and to have or not discs and be 12CM discs or 8CM discs, can finish detection faster, and obtain testing result more accurately, improve the efficient and the accuracy that detect discs when CD-ROM drive starts.

Please also refer to Fig. 2 A and Fig. 2 B, it shows respectively according to a preferred embodiment of the present invention CD-ROM structure top view and side-looking structural representation.CD-ROM drive 200 mainly comprises pallet 210, Spindle Motor 230, optical read head 250 and judgment means 270.Pallet 210 is read discs 220 in order to carrying, for example: 12CM discs 220a and 8CM discs 220b.Spindle Motor 230 is read discs 220 rotation in order to drive, and Spindle Motor 230 comprises a clamping sheet mechanism (Clamper) 232, is read discs 220 in order to fixed bit.Optical read head 250 moves along slide rail 260, is read recorded data on the discs 220 in order to read.Optical read head 250 comprises light emitting module 252, and receiver module 254, for example is an optical diode (Photo Diode).Judgment means 270 electrically connects the receiver module 254 of optical read heads 250, and according to the reflection of laser, judges whether CD-ROM drive 200 is loaded with the size that is read discs 220 and is read discs 220.When CD-ROM drive 200 starts, generally can be to the operation of optical read head 250 advanced line focusings and lock rail, focal length with calibration of laser source (not being shown among the figure), and read head 250 is locked in reference position on the slide rail 260, the position of normally the most close Spindle Motor 230, then can detect CD-ROM drive 200 whether be loaded be read discs 220 and be loaded with that a kind of size be read discs 220.

Shown in Fig. 2 B, characteristics of the present invention are to utilize the reflection of optical read head 250 emission laser L to detect to have or not and are read discs 220, and the size that is read discs 220.Optical read head 250 is prior to laser of reference position (for example being apart from Spindle Motor 230 about 2.5CM positions) emission.Be read discs 220 emission laser L by 252 pairs of light emitting modules, and receive the reflected light L ' of laser by receiver module 254.(or reflection) judged whether to be read discs 220 existence to judgment means 270 according to the reflection signal that receives.If the reflection that receives laser is higher than a predetermined value (representative has reflection), judgment means 270 judges that CD-ROM drives 200 are loaded with and is read discs 220, otherwise then CD-ROM drive 200 is not loaded with and is read discs 220.

As mentioned above, when define be read discs 220 and exist after, drive optical read head 250 again and move to apart from the distance between the about 4CM to 6CM in Spindle Motor 230 centers along slide rail 260 and launch laser again one time, as shown in Fig. 2 B.In like manner as can be known, surpass this predetermined value (representative has reflection) if receiver module 254 receives the reflection of laser, judgment means 270 judges that being read discs 220 is the 12CM discs; Be lower than this predetermined value (representative no reflection events) if receive the reflection of laser, then judgment means 270 judges that being read discs 220 is the 8CM discs.Because only can by the discs 220a of 12CM size be reflected by the luminous mould laser that 252 position launches of determining this moment, 8CM discs 220b since diameter too weak point can't reflector laser, the discs 220 that is read that can pick out CD-ROM drive 200 in view of the above and carried is 12CM discs 220a or 8CM discs 220b.

Though the present invention is that example explains with the CD-ROM drive 200 with pallet 210, yet not in order to restriction the present invention, any have can be in order to the CD-ROM drive 200 in the disc bearing district of carrying disc sheet 220, for example is the cover-lifting type CD-ROM drive or inhales dish formula CD-ROM drive, neither disengaging technical scope of the present invention.

Please refer to Fig. 3, it shows the process flow diagram that detects the discs method according to preferred embodiment of the present invention.At first, in step 300, start CD-ROM drive 200, can lock the rail operation this moment to optical read head 230, and optical read head 230 is set in reference position, then, in step 310, by optical read head 230 emissions first laser, and by receiver module 254 its reflected light of reception, in step 320, judgment means 270 is judged according to the reflection of receiver module 254 first laser of receiving whether CD-ROM drive 200 is loaded with and is read discs 220.When the reflection of first laser is lower than above-mentioned predetermined value, represent no reflection events, judge promptly that CD-ROM drive 200 is not loaded with to be read discs 220 that flow process finishes.If the reflection of first laser surpasses this predetermined value, representative has reflection, judges promptly that CD-ROM drive 200 is loaded with to be read discs 220, proceeds step 330.

In step 330, that optical read head 250 fast moving are extremely above-mentioned apart from distance between the Spindle Motor 230 center 4CM to 6CM.Generally be that the motor (not being shown among the figure) that drives read head rotates, and drive optical read head 230 move along slide rail 260.Control the distance that optical read head 250 moves by motor rotary speed and rotation time.Then, in step 340, by optical read head 230 emissions second laser, and by receiver module 254 its reflected light of reception.In step 350, judgment means 270 is judged the size that is read discs 220 according to the reflection of second laser.When the reflection of second laser is lower than predetermined value, judgment means 270 judges that being read discs 220 is 8CM discs 220b, and when the reflection of second laser surpassed this predetermined value, judgment means 270 judged that being read discs 220 is 12CM discs 220a and process ends.

As mentioned above, detection discs method of the present invention, they be at the first laser of emission of reference position, and reference position can be in distance Spindle Motor 230 center 4CM, and emitted laser can be fixed in any distance that is read discs 220 reflections of Spindle Motor 230.Next emission is that read head 250 positions are moved to 4CM to the 6CM position apart from Spindle Motor 230 place during laser for the second time, is read discs 220 in order to judgement and is 12CM discs 220a or 8CM discs 220b.Yet for the rectangle disc that for example is 9CM, because therefore the submarginal space of 9CM discs record data not can classify as 8CM discs 220b.With read head 250 positions move near but be no more than apart from the place of Spindle Motor 230 6CM of place, 9CM discs emission laser is not had reflected light, CD-ROM drive 200 will judge that the discs 220 that is read of being carried is 8CM discs 220b this moment.

In addition, utilize detection discs method of the present invention, cooperate traditional detection mode again, can judge whether be read discs 220 is fixed on the Spindle Motor 230.Utilize the above-mentioned method of the present invention earlier, judge that CD-ROM drive 220 is loaded with to be read discs 220, and be read discs 220 and be 8CM discs 220b or 12CM discs 220a.The person of connecing utilizes traditional detection method, starts 230 set times of rotation of Spindle Motor and measures its rotating speed.As mentioned above, when rotating speed surpasses first speed, represent not have to be read discs 220, when rotating speed between first speed and second speed, expression is read discs 220 and is 8CM discs 220b, and when rotating speed was lower than second speed, expression was read discs 220 and is 12CM discs 220a.

Be loaded with under the situation that is read discs 220 at CD-ROM drive 220, and traditional detection mode is measured not have and is read discs 220 (when the rotating speed of Spindle Motor 230 surpasses first speed), method perhaps of the present invention detects and is read discs 220 is 12CM discs 220a, and traditional mode is measured into 8CM discs 220b (rotating speed of Spindle Motor 230 surpasses second speed), representing then that Spindle Motor 230 is not fixed is read discs 220, and can repair or change Spindle Motor 230 according to this.Certainly, above-mentioned cooperation traditional detection is read the method for discs 220, can also start Spindle Motor 230 and turn to a fixing rotating speed, measures its required time again, judges according to this whether be read discs 220 is fixed on the Spindle Motor 230.

According to above-mentioned preferred embodiment, the method that the present invention detects discs has following advantage:

1. utilize the no reflection events that has of the laser first time to judge whether CD-ROM drive is loaded with discs, it is very short that it detects required time.After definite CD-ROM drive is loaded with discs, fast moving optical read head, emission laser and have no reflection events to judge the discs size for the second time again according to it.Therefore, the present invention is more faster than known mode by Spindle Motor rotation detection discs.

According to the first time laser no reflection events arranged, can judge whether CD-ROM drive is loaded with discs.After determining to be loaded with discs, again according to the second time laser no reflection events arranged, the decidable discs is 12CM discs or 8CM discs.Utilize this simple geometry notion to judge, than the inertia effect that tradition utilizes Spindle Motor to rotate, more intuition is reliable, can not occur above-mentionedly not producing wrongheaded problem because Spindle Motor does not fix discs.

3. if, not only can detect the size that has or not discs and discs, also can detect Spindle Motor and whether fix discs, so that repair or change with the traditional mode of detection discs method collocation of the present invention.

In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; those skilled in the art; under the premise without departing from the spirit and scope of the present invention; can be used for a variety of modifications and variations, so protection scope of the present invention is looked accompanying Claim and is as the criterion.

Claims

1. An optical drive capable of reading a first size optical disc or a second size optical disc, wherein the second size optical disc is larger than the first size optical disc, the optical drive comprising:

A disk carrying area, capable of carrying a readable optical disk;

a spindle motor, which can rotate the optical disc to be read;

An optical pick-up head, the optical pick-up head can move respectively in a first position and a second position, the optical pick-up head can emit a first laser light and a second laser light respectively to the disk loading area, and Read the reflections of the first laser and the second laser respectively, the first position is within the radius of the first size disc from the spindle motor, and the second position is away from the spindle motor from the first size disc between the radius of the disc and the radius of the second size disc; and

A judging device, electrically connected to the optical pickup head, and judging whether the optical disc to be read is placed in the disc loading area according to the reflection of the first laser light;

When the judging device judges that the optical disc to be read has been placed in the disc loading area, the optical pick-up head moves from the first position to the second position to emit the second laser light, according to the judging device The reflection of the second laser light determines the size of the optical disc to be read.

2. The optical drive as claimed in claim 1, wherein the disc loading area is a tray.

3. The optical drive according to claim 1, wherein when the reflection of the first laser light received by the optical pick-up head exceeds a predetermined value, the determining device determines that the optical disc to be read is placed in the disc loading area.

4. The optical drive according to claim 3, wherein when the reflection of the second laser light received by the optical pick-up head is lower than the predetermined value, the judging device judges that the optical disc to be read is the first size optical disc, And when the reflection of the second laser light received by the optical pickup head exceeds the predetermined value, the judging device judges that the optical disc to be read is the second size optical disc.

5. The optical drive as claimed in claim 1, wherein the first size optical disc is an 8CM optical disc, and the second size optical disc is a 12CM optical disc.

6. A method for detecting an optical disc, which is used in an optical drive, and the optical disc to be read can be a first size optical disc and a second size optical disc, and the second size optical disc is larger than the first size An optical disc, the optical drive includes an optical pickup head and a spindle motor, and the method includes the following steps:

(a) moving the optical pickup head to a first position that is within a radius of the first size optical disc from the spindle motor;

(b) emitting a first laser light from the optical pickup head;

(c) By the reflection of the first laser light, it is judged whether the optical drive is loaded with the readable optical disc, if the optical drive is not loaded with the readable optical disc, the method is ended, if the optical drive is loaded with the readable optical disc Take the CD and perform step (d);

(d) moving the optical pickup head to a second position spaced from the spindle motor by a radius of the first size optical disk to a radius of the second size optical disk;

(e) emitting a second laser light from the optical pickup head; and

(f) judging the size of the optical disc to be read by the reflection of the second laser light.

7. The method as claimed in claim 6, wherein when the reflection of the first laser light is lower than a predetermined value, it is determined that the optical disc drive is not loaded with the optical disc to be read.

8. The method according to claim 7, wherein when the reflection of the second laser light is lower than the predetermined value, it is determined that the optical disc to be read is the first size optical disc, and when the reflection of the second laser light exceeds When the predetermined value is reached, it is determined that the optical disc to be read is the second size optical disc.

9. The method of claim 6, wherein the first size optical disk is an 8CM optical disk, and the second size optical disk is a 12CM optical disk.