JPS59500438A - Gold archival film suitable for digital data storage using low power writing lasers - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Gold record keeping suitable for digital data storage using low power write recorders ``Film'' The present invention relates to a novel high-density recording information storage medium, particularly It concerns such a medium suitable for recording by low power laser means.

Background of the invention Optical storage of digital data is a relatively new technology that utilizes optical technology. Regarding the storage and erasure of digital information, ODD (optical digital data) using associated special media such as discs. As a similar thing, conventionally Such data is stored in the formats commonly used in today's high-speed digital computers. recorded on magnetic media, such as a tape or disk.

This disclosure relates to optical media and related read/write techniques, and particularly to low power lasers. The device records digital information using a focused beam of controlled radiation energy. It relates to the devices used for reading and reading data.

Success in the design and operation of such systems, as known to engineers depends largely on the recording medium. How do engineers in this technology Development of satisfactory ODD disk media, especially suitable for currently available low power lasers From time to time, we have struggled to develop products that are durable and have a long service life of more than 10 years. . This invention is based on a practical ODD disk suitable for this purpose, i.e. today's high speed Used as record storage area in the Ambikota system and its storage area. This indicates something that will be used over a long period of time.

Recording medium knee film configuration suitable for the irradiation beam: The conditions for such an ODD medium are strict. For example, high bit densities, cost-effective information storage, sufficient Involvement includes penetration/reading speed, and preferably the use of low power lasers. (Technology Recognizing the simplicity, speed, and power of performing such laser processing, ,'For the diving operation, the laser beam only needs to be modulated or refracted. ) In related applications (e.g., video disc recording), engineers Using f, :,, and [), the metal film is used as an "information layer" in their configuration. We presented a medium using film. This layer has voices within it as “hits”. writing to form a “do” (pitch, hole, bubble, etc., or other processing) Laser beam (thus softening and melting.

or evaporated (thermally processed). Such films are It is possible to coat the surface of the screen.

Some engineers believe that such laser recordings can be used to record various computer records (e.g. I felt that it would be promising as an ODD medium (as mentioned above). They are the actual system envisions a recording medium that is responsive to low-power laser writing, and therefore this is not the current practice. It is possible to discover information layers (materials) that can be dissolved in MA (or evaporated, etc.) at low power levels. I expected that there would be a lot of disagreement as to whether the This also means that its related system It will also depend on the irradiation zone.

Therefore, engineers are looking for a high "thermal efficiency" (a fraction of the heat generated at the recording location). () is effectively stored locally due to the “bit” shape) From time to time, they continue to search for such laser recording materials that show are recording materials with low melting points and low heat dissipation properties (e.g. tellurium, lead, bismuth , and indium). The low melting point is probably the lowest energy write parameter. to minimize system cost or increase bandwidth. I can listen.

Engineers also feel that they must use low-power lasers for such recording. (For example, in order to extend the operation time of the laser f device and to reduce its cost and size. Therefore, the metal chosen for such information (absorber) films is extremely It is further preferred to have a significantly low “melting point” (“moderately high sensitivity”), and Therefore, the claimed "bit void" can be formed with minimal laser power. is desired.

Te absorber film: Currently, many engineers are using this or related laser recording technology to We have already implemented the use of Te absorber film. Besides (for some reasons) There is. Tellurium has an attractively low (bulk) melting point (approximately 450'C) and It has poor conductivity and can provide good sensitivity and S,'N ratio. It is relatively convenient to deposit as a thin film. Same goes for bismuth It is commonly suggested for a reason. Also related alloys (e.g. Te-Ge).

5-36 and B*-SC> to T'e-... have been suggested as having a certain taste. Ta.

Tellurium has a relatively low heat dissipation property, and compared to, for example, aluminum. In all cases, the low write threshold (()) and energy could be considered as an indication.

See, e.g., U.S. Pat. No. 4,222,071 to 3e11 et al. E, Vol, 177, 0ptical ■nformation 3t.

rage, 1979. “Review of” by Z ech after page 56 See also “Qptical Storage Media”; E, VOl, 123.0ptical 3torage Materia Is and Methods, i 977, 3art01i after page 2 “QptiCal Recording Media Review” by ni ”See also.

For example, on this day, artoli's old editorial is 10! together with other optical recording means of the class We are discussing such absorbent films (“processable thin films”). They include organic compounds that are known to undergo photochemical changes that involve fourfold changes. Contains ``optical polymers,'' which are compounds. It is arranged and used so that "° pits" are formed in the absorbing f4 layer by writing. We are discussing the absorber film that will be used in this project, and this bit information is ) is detected by a change in foul ability.

In such well-known ``processing records'', a high intensity radiation beam (laser) is used. Thermal energy given by the writing beam beam of the position” is melted or processed in at least a portion of its beam cross section. It must be something. At that time, many people believe that the surface tension causes the formation of "plane-like pores". (see the editorial by Z ech cited above), which is usually This results in the formation of an oblong "pit" or hole. (Coclran and F. ``1vleltino to 1oles in Metal'' by rrier Films for Real-Time, High 1) intensity [) ata Storage”, SP (Ep roceedings, 1977 (August, see PI3-P31) Absorber film: One feature of them is that the related type of rape record is (i.e., up to its bulk melting point) I have found that you can do this without heating the cut position. And as a result, Relatively high melting point and rather high thermal conductivity (these features make technology 1 suitable for this purpose) Materials like gold have surprisingly good absorption (something that has been avoided by many) It forms a body film, and its desorption is compared to the “previously preferred” absorbers such as tellurium. I have also found that they are of comparable sensitivity.

Of course, those made of titanium, gold (also platinum, rhodium, nickel, chromium, Manganese, and vanadium; e.g., 3ell U.S. Pat. No. 4,285. , No. 056 matc + tIBM TD Bulletin, 1'971 3 The high melting point of polymers (see page 301 of the 2013 issue) also makes it difficult to absorb such processing. I had a vague idea that it might be suitable as a collection layer. However However, such speculation does not address the actual issue of performance sensitivity or, as mentioned above, Be careful about how low-power rapes can be recorded, etc. Not paid. Alternatively, those assumptions ignore the associated high thermal conductivity issue. (Heat is conducted radially from the recording position, writing energy is consumed, And sensitivity deteriorates: metals like gold have high thermal conductivity, but Ti and Te Note that this is not the case).

Until now, observed sound velocities generally indicate that "high melting point" metals are completely unlikely candidates for absorbers. (e.g., as discussed in cited U.S. Pat. No. 4,222,071). The “low melting point” and low conductivity of Te gives excellent sensitivity and It has been recognized that it can be recorded by low power lasers. therefore , its exact opposite; i.e. gold, which has a high melting point and is a good thermal conductor. Metals should theoretically be the worst absorbers. ).

Nevertheless, the present invention provides that just such metals, such as gold, can be used. Possible and at least known absorbent materials, such as highly immersed archival It is shown that it can function equivalently to an absorber (which has the same sensation as Te) along with life.

The invention further provides that such an absorbent film (contrary to what the prior art teaches) ) The bit position is heated to the conventional bulk metal melting point for recording. clearly indicate that there is no need to

Extended record retention life: A major attraction of optical data storage technology is the ability to increase storage capacity1 (e.g. This is on the order of 100 times that of magnetic tape). is intended here optical data discs that last for an extended recording life on the order of 10 years or more. It would be expected to store (“non-erasable”) information. Such an extended lifespan is a goal that has not yet been achieved in the prior art; Sonic wishes to do so with all his heart. The present invention provides a medium that exhibits such a recording life. It is especially promising for use in optical large-scale memory and such applications.

In contrast, commonly proposed absorber metals such as hismuth and tellurium are less It is known to oxidize quickly and otherwise are known to easily degrade in performance; therefore, they It is not suitable for record keeping (e.g.

19s'tq paper by Δsl+ et al. cited later; and ZCCl) editorial; See also what is shown by Example 2 below). Technical speed of sound is tel It is recognized that the oil has a particularly poor storage stability, which means that the Signals degrade over a short period of time. This deterioration is accelerated in a high humidity environment. Typically characterized by a rapid increase in overall light transmission (possibly due to metal due to the general oxidation of), the selected bit position in the metal film. It is characterized by severe corrosion starting at the defect location of the bismuth. The same is true.

This demonstrates similar utilization of absorbent films for extended archival stability (such as triggers). The invention describes these materials as computer information storage media. The use of such optical data, especially for computers (as in Table ■) - Excellent storage stability and stability when used as disk recording.

Therefore, as a feature of novelty, I The intention is to use materials that are That is, such materials can withstand typical FDP stress. Excellent resistance to deterioration due to oxidation or such atmospheres during storage and use. It is something that exists. Therefore, over an extended storage life, “read” By maintaining sufficient reflection stability against It won't happen. However, this alone does not require the actual storage medium or associated system. This is a problem especially when “good” sensitivity is also required. Ru. The invention will be described below with respect to kneading.

The novel recording media and associated deposition techniques presented here generally meet the aforementioned criteria. In addition, if possible, i, the ``target performance base ring'' shown in Table I below may be intended to fit one or more of the following: (hesh and hel1en “Qptical properties of 7’ellurium” by l"11m5g5ed for Qata Recording", 5PfE Pr.

ceedings, \10f, 222.1980; and by Rancourt. “Q63ign and productNon of Te1luri+,+ mOpth cat [)ata [)1sks”, S P I E Pro ceedings.

Vol, 299. See 1981. ) Table I (target criteria for media) 1. High sensitivity: Allows recording by low power laser means. ``Sensitivity'' refers to bit formation (spot A change in reflective performance due to holes or other voids in the medium or such (such as those arising from the formation of changes, giving appropriate succession at the intended reading speed) It is understood as the minimum radar power required for According to the invention, typically is a radar of the order of 5-15 mW for a time of approximately 40-60 nanoseconds (pulse period). It is possible to ``clean up'' the output. Shigamo readout Kusunari t5 (repeated play) It will not deteriorate even if

1-A, high S/N: (appropriate readout): to R ~ 1 noise to 1 - about 30 ~ 40dB 1y4in, peak signal oak (for proper readout) ratio of signal to noise.

2. ``Record storage stability'' (life span of 10 years or more): ``Normal computer environment'' for about 10 to 15 years without falling below the minimum readout (minimum S/ N) can be used or stored.

3. “Computer record”: Intended for the ability to work with today's high speed digital computers. parable for example, at least as capable as today's magnetic disk storage devices (for example, For example, a bit density of about 106 bits/cm' or more, i.e. less than 1°-6 raw bit error rate”).

4. ``Can be precipitated'': Suitable films can be deposited on a “commercial scale” with reproducible and controlled properties. show.

5. ``Can be overcoated'': Absorber film can be overcoated (for example, up to a few inches of iooo), sacrificing one of the above features. for example, still give an adequate readout and mechanically preserve the film. protection and protection from “surface contamination” (preferably the overcoat also protects against heat, contaminant gases, etc.) protect the absorbent film from

Therefore, the objective here is to provide the aforementioned and other related features and advantages. That's true. A more specific purpose may be ``Pailand'', or - such It is possible to show the deposition of gold in a discontinuous form or such an absorbent film (information). Ru. Another purpose is to extend archival life as well as to be suitable for low power lasers. The objective is to present a film that exhibits good sensitivity. Yet another purpose is to demonstrate the preparation of a recording material suitable for recording that does not require "dissolving" the information layer. In other words, while maintaining the melting point of the recording material's bulk, ″Bit (bit) formation.

Brief description of the drawing *These and other advantages and features of the invention are described below in connection with the accompanying drawings. Become better aware of the technology of sound speed by referring to the detailed description of the preferred embodiment will be done. Like reference numbers indicate like elements in the accompanying drawings.

FIG. 1 is an idealized partial cross-sectional view of a recording medium according to the prior art.

FIG. 2 is a cross-section of a novel preferred recording medium embodiment illustrating construction in accordance with the principles of the present invention. It is a diagram.

FIG. 3 is a cross-sectional view of a preferred embodiment of the disc recording medium.

FIG. 4 is an idealized plan view of the recording hit position.

FIG. 5 is a cross-sectional view of another preferred embodiment.

FIG. 6 is a greatly enlarged portion of another bit position written by the present invention. FIG.

FIG. 7 is a diagram showing the relationship between λ and error rate for two examples.

FIG. 8 is a greatly enlarged partial planar schematic view of another embodiment.

FIG. 9 is a mechanical schematic diagram of another application of the invention.

10, 11, 12, and 13 show filters in various embodiments. This is a transmission electron micrograph of the sample.

Detailed description of the invention "Te example": Tellurium absorber: ('control'): Figure 1 is an idealized version of the optical recording medium 1. It is a schematic illustration of a cross-section of a It is manufactured and operated according to the method described in the paper of medium The body 1 is provided with a support material 2, on which is provided an "anti-reflection" base △R, An information layer ('absorber') 5 is provided on top.

Preferably, the base ΔR is provided with a reflector plate 3, on which +, 1.5Δ A photosensitive spacer layer 4 is placed thereon. Layers 3 and 4 each have their intended readability. It can be characterized as first-order reflection and first-order transmission at the output/write wavelength. ,1 m3゜4.5, as is known in the prior art (paper by △sh), It makes sense to form multiple layers of low-reflection (anti-reflection) designs across the visible spectrum. It will be understood.

Preferably, the reflector 3 is aluminum or the like, while the spacer 4 is transparent fused silica or such a bright dielectric, approximately one quarter wavelength thick. [That is, N×λ/4. where N=1.3.5, etc.].

The support material 2 is preferably used for digital magnetic recording as a computer disk drive. Made from polished aluminum discs of the type currently used in It is used to make the surface sufficiently smooth and flat for the deposition of the reflector layer 3. An organic smoothing layer (base layer) 2-8 is applied.

This is a 14-inch disk running at about 1800 (to several thousand) rpm. Good surface smoothness (e.g. less than 4 x 10-' inches peak-to-peak) order).

A radiation (laser) beam of controlled energy and wavelength is directed from a laser source onto the medium 1. to form ``bits'' or such ``processes'' on layer 5 and to ``write'' them. is made (for example, at the position of V'' shown in phantom).More specifically, , 10 mW Gauss of diameter 0.8 μIl (i.e. 8000A or 1,/Σ) Using cyan beam, scan at 451n,/’sec, Q, 8um A minimum length of ``bits'' (not necessarily circular or other controlled shape) consisting of the width of However, this condition cannot be met by conventional means. too strict).

The prior art recording body 1 in FIG. It is mentioned to provide a means of identification. And unless otherwise specified here All materials, methods and equipment are currently well-practiced and generally known. It is intended by means.

Here, the metal recording film 5 is deposited on the ``transparent'' dielectric spacer 4. , the thickness of both of which are chosen to form a structure of known low reflectivity (e.g. Old editorial: When recording at λ = 488 nm, the reflectivity is less than 3%. (obtained by T1 of 5 mm on S+Oz spacer of 8Qnn+). next , each “bit” (bit) is recorded, this reflective anti-reflection substrate has a high The trust is processed to form a pavit suitable for reading. If the wavelength of be changed. This “triple layer” or “dark mirror ([)ark M1r” ror) "The surface reflectivity (on the absorber 5) in the structure is "zero" or absorption By adjusting the body thickness and spacer thickness by 1, it is possible to select 1 shift. can. Here, "triple fiber" has an absorber on one surface and a reflector on the other surface. It can be understood that it consists of transparent spacers.

1 (・i Sound velocity can be omitted in some cases with a reflector film (for example, , ° by “dielectric mirror”), and Sub-4J/I can be used with other materials and structures (with For example, it will be appreciated that it could be formed from several layers of similar material that are more thermally insulating. cormorant.

Here, the coating parameters are different from the writing beam to this absorber layer. When the light is focused, the so-called disk becomes “reverse” to the intended recording frequency. [For that matter, Be1l] “Anti-Reflection 3 truc+” by 3 pong ures for Qptical Recording”, Journal of Quantum E 1 electronics, Vol, QE 14 , No, 7. JulV, 1978. See; regarding general prior art. Please refer to the following typical literature: 'Qptic' by Bartolint et al. alDisk Systems Emerge”, (EEE Spectr Um.

△gust 1978. +1.20: and “Qp” by Bartolini tical Recording Media Review”, Sp [Ep roceedings, \10f, 123.1977, p, 2: “Qptical 3 storage ~ Materials and fvl ethods”, 3pIF Proceedings, Vol, 177 , 0ptical information 3torage, 1979.　 p, 56°] Preferably, the deposition is performed such that the reflectance of layer 5 is at a predetermined reflectance level. is advanced by thermal evaporation until it reaches a point.

As technology knows, this can be done empirically, or P ii′! 5 is precipitated (precipitation technique described in the cited Zech literature) Continuously measure the reflectance of the absorber film (e.g. on a reference specimen) or a similar suitable optical method for deposition monitoring. It is also possible by techniques, more commonly known as monitoring the deposited mass Other methods and electrical characteristics are also possible.

Thus depositing an opaque layer 3 of aluminum onto the coated disk 2 (can be selected with respect to all optical properties of the laser spectrum). Next Then layer 4 of 5102 (fused silica or some such "transparent" dielectric) is added to layer 3. is deposited on top to a controlled thickness, this thickness being related to the operating wavelength λ0 ( Here, 1/4λ or 3/4λ. is slightly smaller than either ru〉.

On layer 4 an absorber film 5 is deposited to a thickness that yields the intended reflectance ( (see below).

The reflectivity of the recording medium 1 is determined by the irradiation beam from the writing laser at each bit position “v”. When detected by appropriate means, the “void region” V (all However, as is known in the prior art, A ``non-void'' background of low reflectivity around it as a spora I-'' of It can be identified from the

For example, 3ell U.S. Patent No. 4.285.056@ describes such a medium. where it is recorded as a "hole" in both the absorber layer and the transparent spacer layer. and the length of the holes and the unexposed (illuminated) area between them is the frequency The numbers are varied along specific information tracks that convey information. This patent Seeds deposited using conventional evaporation techniques or electron beam 7ii triple bombardment techniques may also be used. various materials (such as titanium, rhodium, platinum, gold, nitrogen, chromium, manka) vanadine). In comparison, rice such as K. National Patent No. 4,183,094 discloses that forming such bits is describes laser recording on Te-GO-8e-3 material which results in a change of 1.

However, the 3ell has its spacer layer heated by the writing beam. This differs from the intent of this case in that it is necessary. wife and his spacer layer is removed by itself (i.e., otherwise (to form voids) or to decompose or sublimate must be heated and the top layer (e.g. gold layer) removed to produce a pubble It is necessary to generate enough gas to In this case, in terms of wood quality, one channel of the beam It is not necessary that the ki be absorbed by a similar spacer layer.

Tellurium is generally preferred by engineers for its ``low melting point, low conductivity''.

It is metal. This is because it shows a greater sensitivity and therefore the required (Threshold) This is because it is considered that the Lena soil-filling output can be small. .

For example, this idea was introduced by Belf and Bartol i in old U.S. Pat. No. 4.222, No. 071, where similar tellurium It has been characterized as requiring a laser power of approximately 20 % optical efficiency to achieve a suitable sequence, and this goal is recorded This enables playback of video signals with an S/N of approximately 110 to 50 dB, or (It is to enable readback of ``broadcast quality.'')

[They also specify a solid-state GaAu-ΔS irradiation laser, approximately 1 micron in diameter. A continuous beam of light is applied to the recording surface. Meanwhile, the recording surface moves relative to the beam. continue. ] U.S. Pat. No. 4,222,071 discloses that the absorber is a It emphasizes that it must be a ``melting point metal'' (also a ``continuous film''). and should not be 'microscopically agglomerated': i.e. It must not be in the form of a pai-island or “island” that is clearly: ).

Preparation of absorber layer 5 (Fig. 1): The absorber layer 5 preferably consists of a relatively thin layer of tellurium, which is separated by a spacer. onto layer 4 (its recording surface is relatively smooth and below λ/20) evaporated). The l'-e preferably has a large hatchet coatin. The slivers are cap-generated in a high vacuum using a vacuum chamber to ensure better uniformity. A large coating distance and double rotation of the substrate are adopted for the purpose. For example, the refractory metal Boi~ is used for the sauce [1.2111 box-shaped The coating chamber is used in the ASh literature]. all dust and dirt must be severely reduced using the most rigorous "Bakulean Room" technique. .

v7 Straight 2 is polished to the desired smoothness and coated with a thin 1) layer 3 analysis. ``SubiJing (undercoat)'' to a smoothness suitable for accepting 2-Sr coating at least “dynamic” with respect to the intended irradiation spectrum. High fouling ability in the working area) Made from a flat aluminum plate. aluminum Since aluminum is not a perfect reflector, in some cases it can be used as a “multilayer dielectric” or Technicians will recognize that replacing 1q with such.

Spacers 4 are deposited on the reflector 3 in a similar manner.

Spacer 4 is a dielectric material, which is used for the "active part" of the laser spectrum. Relatively transparent. Steamed WSi○2 (silicon dioxide) of approximately 1,583 A is used for this purpose ( For example, should the writing/a output at λ=6328A be satisfied? Understood. Tellurium's absorption 47 body pain 5 is the intention 1 (e.g. typically 2596 absorbency: 30% Reversibility; transmission of approximately 4.5% of beam energy; due to 3-layer cancellation it is reflected ), the thickness of the absorbing layer 5 is equal to the thickness of the spacer 4. Dependent. If the transmitted light is to be reduced, the spacer thickness should not be increased. (NXλ7/4 period; probably also reduces heat loss) It would be desirable.

The technology is to develop a Te absorber with a low melting point, relatively short heat dissipation length and low conductivity. 5 is considered a "highly sensitive" material that helps conserve the irradiated laser energy. Ru. When the writing beam from the laser source L is focused on the layer 5 at the ``V'' position, Small portions of that energy are deflected, other small portions are absorbed, and large Parts are transparent. The transmitted part is reflected by layer 3 (main k) and absorbed into layer 5. will be collected. Therefore, both the bulk energy and the reflected energy are absorbed by the film 5. heating to minimize transmission losses (note: the precipitation of 5 forms a "triple layer"). Sucking Variations in body thickness or uniformity should be carefully removed. because For example, this variation reduces the writing energy absorbed into the absorber film and reduces the sensitivity. This is because it deteriorates the quality.

result: For our purposes, ° ``sensitivity'' is sufficient reflectivity ( or similar read characteristics) is understood as the write energy FW required to change the .

The intensity and exposure time of the focused writing beam give the required readout quality (around V). absorber layer () sufficient to cause a specified change in reflectivity (at) 5 (e.g., thereby increasing the temperature of the prior art) An appropriate contrast as is known from the technology of sound speed and (yoS,,/ N ratio is realized). Typical of 40-5Qd3 for a bandwidth of about 15MH2 See standard signal-to-noise ratio (beak-to-peak signal to RMS noise).

Here, the test record is gas Ray +f (He-Ne) operating at 6328A. ) beam, and the recording time is 30 to 470 nanoseconds (usually 101nW). 40 nanoseconds or about 400 pJ). This is the minimum when reading at low power. is intended to produce a good readout or S/N of approximately 40+dB, For example, the output power is 150-500 which can be obtained using the same or similar laser equipment. pJ, /cm2 (pJ-10-” watt-sec, or joule) It is. 1X (D For the intended assembly, the laser is approximately 1/2 diameter Assuming a write pulse of approximately 40 nanoseconds focused on the seconds, which adapts to the rotation of the isoorpm disc and opens the door. Also applicable to galvo-mirror light collection characteristics].

The recording body 1 is recorded in this way. (Comparable situations in literature, etc.) ) The Te film (1) has a relatively low output and dissolves well with pulses. can be yo (known as Pavi 1-'' or ``Crater (crtI) ter)” with good readout (e.g. 1-3% pasec in λ-632a) The bit reflection rate is about 50% relative to the ground), but there is very little noise. ” is also included.

It appears that such a Pavitt pi 1-'' actually forms a void (and For example, look at the photos in the literature of △sh. It is a 2-10mW, 100ns laser. ``Crater'' in a similar Te film recorded in The Pulse. A 25OA film of Te used in reflection mode has a wavelength of 4500A. It is said to have a reflection rate of 57%, a transmission rate of 6%, and an absorption rate of 37%. ). death However, due to the fact that such Te films are deposited as a continuous layer, However, the formation of a “bit-bit” (V) is accompanied by a rim surrounding it. It is stated in that document. And, this rim is closely related to the “noise” mentioned above. It is believed that there is a close relationship.

Obviously, the minimum writing energy Ew within the minimum temperature rising time (for example, 40 Approximately 10 mW laser power (within nanoseconds) is required to form a proper “hole” (For example, if high power is applied too slowly, the heat from the absorber will escape , so the "bit" is not written. ).

Such a ``hole'' or ``pitch I~'' in Figure 1 shows the hole at ``V''. Implied as a location. Then, at least some of the absorbent material 5 is revealed. The crab softens and moves at the pill location, reducing the thickness there and increasing reflective ability. (at least that is what the prior art teaches; for example, the sentence No. 4,222,071).

Such spots can be read out by means known in the art; For example, using a similar laser at low power (e.g. 311 using the laser described above) ). The increase in reflected energy received (with a suitable photodetector) is recorded. is sensed to produce an output signal representative of the hit. These pins 1~ easily identified from the background. The reading energy of Moraron is recorded as such. It is insufficient to "erase" or disturb the recorded bits. [Note: Reading The "bit depth" causes a phase change for the light reflected on the Te surface, and This is done at a frequency f6 that provides the maximum contrast. 】me【 1: I, as stated in the literature (see e.g. oxidation of △sh literature, etc. ) I learned that the storage stability of this "Te recording medium" is extremely poor. parable For example, recording medium 1 (the one without a protective film on layer 5) under known temperature and humidity cycles. ), its reflective ability increases by 50% in about 2 to 3 weeks, and this is mainly due to oxidation. (the “hole” should have a “high” relative reflectance, but the acid (to avoid increasing the ``background foul rate'' between holes), cause loss of N. ). The Te film of Example 1 has such "aging" )'' is characterized by a rapid increase in overall light transmission. It will cost you money.

This is probably due to not only the general oxidation of the metal, but also the “ This is due to severe position-selective corrosion starting from the defect location (MIL 5P (See similar test by EC#810-8).

This is based on the requirements for "archive storage memory" mentioned above (Normal Computer Operation 7/Storage Memory). exposed to conditions for about 10 years; see Table ■).

Example The following are some examples of cryoabsorbers in the form of island films according to the present invention. It shows typical uses and benefits of. Its advantages and characteristics are described above. It will be better evaluated by comparing it with "Example".

Example ■; Absorber made of gold: Figure 2: It is said that a "total absorber" film 15 is used in place of the tellurium film 5. Other than the characteristics, the operation of the above-mentioned ""Te example" in the new recording medium 10 (FIG. 2), Materials, methods.

and the structure is repeated here again.

The recording body 10 includes a support 12, and on top of it is a reflective anti-reflection base 1-△R (first Similar to △R in the figure, preferably a reflective layer 13 is provided, and a transparent spacer layer 14 is placed on the layer 13. is placed on it, and the substrate 1-△R (its space + j14〉 An absorbent film 15 is placed on top.

Here, according to its characteristics, the absorber 15 functions as an absorber film. precipitation (somewhat similar to the Te film in “Example 18”; e.g. ``gold'' filaments consisting of ``island layers'' made by similar means) It consists of Lum. Here, during the deposition very careful attention has been paid to reducing the absorber thickness to 1il. Intended minimum damage paid to control I and further described below. form a plan R (for example, 10% is chosen here).

The important thing is shown in Figure 11 (100,000 times Te micrograph) and will be discussed later. The film 15 is discontinuously shaped into the air condition 1 to condition for optimal results. This is what is being done.

Otherwise, the underlying spacer layer 149 reflector layer 13. and subst Rate 12 is at least functionally the same as the Tee example, so Absorption as understood in the technical field (e.g., reading the cited literature) It is thought that it functions as a "triple layer" with the body 15.

Therefore, the gold absorber film 15 is preferably applied on the surface of the 3io2 spacer 4. It is formed by evaporating gold onto the surface. This is the well-known "triple layer" effect. The surface reflectivity of 5 is set to a preselected value Rm (here 10%) This is done with care to form an island-like structure until the reflectance decreases to The emissivity Rm can be conveniently set directly to accommodate appropriate "writing" and reading. It is. Here, about 10% (minimum value for proper focusing of this laser, etc.) ) were chosen arbitrarily. Somewhat surprisingly, the aforementioned (as in the Te example) “Writing” with a laser beam of Changes in reflectance (while the "written" spot has an anti-fA ratio of 25-55%) 3, , / N in the range of 25 to 4(,) dB; in some cases It was found that an increase of 3Q-5Q% is sufficient. The technical speed of sound is - For unused or original absorbent film, It will be appreciated that one option with "small reflectivity" can be selected.

Preparation of absorber layer 15: (Fig. 2): The absorber layer 15 is located on the spacer layer 14 (i.e., on a relatively smooth surface; e.g. ．． A very thin eye deposited (thermally evaporated) onto the recording surface of 52 Somewhat unexpectedly, 10% of When gold is deposited on this “triple layer coating” up to the “minimum reflectance” Rm, Pai Lantpa was formed and intended...-The 1! : Include beam (6338 people) , 1.0mW.

40 nanoseconds), the reflectance changes significantly (which is entirely undesirable and Totally unexpected-); each is quite sufficient for a proper sequel. (For example, increasing from about 10% to about 25-55%: Result details below (see discussion).

The absorbent film 15 is therefore preferably made of a smooth material using currently preferred technology. -1' layer -14 is vacuum deposited (e.g., 'pure' gold or a thin vacuum chamber). It is deposited in the chamber at a vacuum level of about 10-6 to 1Q-'1 orr, and it is (performed at a deposition rate of less than

Preferably, the silica 14 is itself similarly deposited with a gold film 15 before being deposited. Vacuum deposited. All substrates have this quality for optically thin films. Cleaned according to good practice.

This precipitation (due to thermal evaporation) is caused by a predetermined maximum Proceed with the necessary “island” formation until a small reflectance level (Rm) is obtained. is important. Otherwise, the desired result will not be obtained.

As technology knows, this is not possible empirically or satisfactorily. The surface reflection of the reference specimen while the absorber film 15 is deposited until it appears This can be done by continuously monitoring the rate (cited in Z ech The precipitation technique described by him in the literature, or the precipitated mass or Refers to other known techniques such as monitoring electrical properties during deposition. Shine on).

result: The results, especially in light of the expected properties, are also "T e example".

Compared to conventional media such as T'e absorbers prepared as described above in It's very surprising. That is, the recording medium 10 is recorded on and read out. and its sensitivity was measured and evaluated as in “Example 7-e”. For example, using a He-Ne laser system of the type described above). write like that The inserted bit position is like an ``agglomeration hole'' (where the absorber is agglomerated). The absorber material moves around or beyond the hole. The diameter of the hole is 1q compared to the diameter of the reading beam (e.g. 1/4~3. /4>, showing a similar increase in reflectance and higher output signal.

Figure 6 shows the ``agglomeration hole'' (or pseudo-hole) that is produced in such micrographs. It is an artistic expression that indicates "similar bit").Here, "agglomeration hole" 15p is generally As a roughly circular written spot or as an unwritten virgin absorber It will be understood as a physical-optical discontinuity in the film 15v. spot 15 p is on the order of the laser beam diameter (e.g. 40-120% of it); Contains a "rim" or partial rim around the periphery of the rim.The inside of the rim usually has relatively little There is some absorbent material present: what is present is agglomerated into absorber globules gC. Many of them are relatively large; for example, many of them are It's bigger than Virgin Film 15V or the small Pa Island'' in Figure 11. , there are usually only a few over relatively large distances). In short, spot 1 5+ is an “optical void” or discontinuity for the selected readout wavelength (λW) On the other hand, Virgin Island Film 15v1 had a relatively continuous ending. may be understood as a (partial) reflector.

Therefore, the technical speed of sound is such that such "agglomeration holes" 15P are known for tellurium. Recognizing that it can be functionally equivalent to traditional bits such as (See Te example and references).

As will be detailed later, such a G-shaped absorber film forms an excellent recording medium. See what's possible: remarkable archival stability, unexpectedly high sensitivity, and and high S,/N, while surprisingly low write energy and clearly low write It only requires a higher temperature at It has responsiveness. [, where the useful overcoating is within the range of practical usefulness The operating performance will not deteriorate beyond this point. Currently, Te absorbers are deteriorating and Perhaps the reason for this is that it clearly requires relative movement of the absorber material. Will. In contrast, the present invention removes most of the absorber from the human location. or a bit to pass the reading beam through without having to move everything that way. ・Technical speed of sound lies in the fact that it is possible to “record” or “open” holes. You will be pleasantly surprised to find out. The present invention is achieved by "agglomerating" the can be implemented, thus reordering the absorber within the bit position, but Outside of that bit location l\\ requires little or no material movement; Or there is no need to remove it outside of that area. 1 details are given below.

Island shape of absorber film: FIG. 11 shows the first virgin (i.e. its Microscopic top view of the reflective surface (not recorded above) (transmission electron microscopy at 10'Fi microscopic photograph). This surface is a physically discontinuous or partially discontinuous “island” Looks like a structure, fairly uniform pattern (semi island on S102 spacer) It is clear that this indicates that Regarding this example ■, the island is number 1 It can be seen that they have a diameter of 0.00 and are separated by intervals of similar dimensions. (For example, 5000-100 film 15 will be in the "% void" range) (e.g., a few to 10% voids).

Now, pass this virgin agglomeration to the laser recording beam as described above, and then '''% i~ Increase void °° t! (larger island spacing), go Ejecting large amounts of island material from the location to the surrounding area and beyond the surrounding area. (e), if it becomes, there will be a (small, not necessarily continuous) “rim” In this way, an ``agglomeration hole'' as shown in FIG. 6 is formed. Here, this This process is characterized as "agglomeration."

This “island” structure was unexpected. What is even more surprising is that We take no responsibility whatsoever for the realization of the 'recording characteristics' and the characteristics of the It has been shown that the effect of

As mentioned above, forming the ODD absorber film into an “island” IM structure is not mentioned in the literature; not only that, but the literature contradicts good practice in this case. (For example, U.S. Pat. No. 4,222,071 clearly states that (as per the above discussion).

At least some of the primary factors controlling such island formation are: Repository material, deposition rate, frosting; substrate material and condition (e.g. cleanliness, roughness, etc.) and temperature; presence of ``nucleation'', presence of vapor contaminants (degree of vacuum), and such factors, and they may be recognized by the technical speed of sound. cormorant. For example, a substrate that is too cold will form a continuous film; However, at too high a temperature, no film will form at all.

In this regard, the technical speed of sound can be compared to Figures 12 and 13 with Figure 11. Ru. In FIG. 12, bis oxide for nucleation is shown as known in the prior art. A similar film (as in Example 1) except for the silica substrate covered with a mass layer A film is formed. Figure 13 is similar, but instead the nucleation layer of chromium is used. Compared to Figure 11, Figure 12 shows thinner islands with wider spacing. Figure 13, on the other hand, is a continuous gold film (A There is no Iran).

The quoted laser device (as quoted) is shown in full on the film in Figure 13 at the L output level. On the other hand, the film in Figure 12 had a slightly lower sensitivity. It was possible to write in the same manner as in Fig. 11 (Example ■), except for the degree.

The technical speed of sound is determined by such "island" patterns (due to factors such as read/write conditions). (e.g. writing energy, beam width, λ, etc.) You will realize that you can give Thus, in example ■, about 40 A satisfactory bit hole with a diameter of 00 to 10,000 A can be used for specific writing beams. It is formed using (ii, give <S/N, etc.).

Island diameters that are too large or too small may be unsatisfactory. It will be measured. More specifically, the dimensions and spacing of virgin islands are When recording, the average island must be suitable for agglomeration. The diameter is much smaller than what is becoming a continuum film (i.e. 2% void thermally isolating individual islands); One Buddha of that island is (ratio) for the selected λ(R,,,'W laser) The absorber film 15 is placed in a relatively continuous manner (like an optical reflector) so that the absorber film 15 is visible. % voids must be sufficiently small). If the spacing is sufficient , when the spot is laser-heated (written on it), the film 15 “ The above-mentioned “agglomeration hole” is formed to produce an “optical switch” and is detected. The foul i will show a marked change and become more agglomerated. It corresponds to S, /N, etc., where a change in reflectance is included, that is, a "spot" becomes ``relatively transparent'' and, like a traditional ``bit'', the associated optical system It becomes an "opening" (transparent) relative to the stem.

In addition to (previously), here the writing beam acts on an island within the bit position. agglomeration” and (usually) an associated increase in average island size and spacing. resulting in an increase (increased % void area). The initial virgin)% void is , sufficiently accommodating the intended minimum radial heat loss, and with an initial reflectance (Ro) of It is so large that it exceeds Bozero Zui (known as "Dark Mirror"). It is estimated that

Of course, if a ζ′3 awn is formed in its optical lower substrate, its absorption The object, space 1, reflection q, 1 body actually increases the reflective power (for example, here (from about 10% to about 30%) Normally, this writing operation consists of removing a significant amount of the absorber material at the pill location. It provides energy to the absorbent film. In this way, I read If a spot that is not covered shows 25% absorption, 45% transmission, and 30% anti-sword, then The written "spot" has these values about 30% and 1, respectively, with respect to its writing wavelength. It will change to 0%, 60%.

This ``write'' increases the percent void (area), so the write The system clearly energizes the writing spot islands and This increases the average size of the nodes and also increases their average spacing. They "agglomerate" into fewer islands, and the island form "thin metal films" are a common proposition in the literature (following the attention of R. For example, the article with the same title by Ool'emus, J.

pp, physics:, June 1966, Vol. 37. #7゜P2 See below 775. Gold film is mentioned there. :　T　ruon "Qptical Con5tants of AQ aggregated" gold Film n, Journal or QptiCa13oc* ety c, m, V61. 6 6, #2, F cbruar\ l　197 (See also 3, P124 and below. There, a gold film is heated to 300°C. It is formed by vapor deposition on the glass care straight, and its sonic velocity is We believe that it is reasonable to assume that the material itself has bulk optical constants. . ；△n　d　e　r　S　3 truct by S On and NO Orman ural and E 1eCtriCal properties or [ ) iscOntinllous Gold Films on Glass”, Vacuum, Vol, 27. #4.1977, Pergamon See also press, Great Br1tain.

It examines the electrical resistance of such films, and this resistance is similar to that of bulk gold. It shows that the resistance is greater than the resistance. ).

However, such an island film of gold or any other metal It is said that using ' as an ODD relay recording medium has obvious advantages. No one seems to have discovered that. In fact, the technical sound velocity is a ``continuous'' absorber film. It seems that it was intended only as a film. (For example, cited U.S. Pat. No. 4.2 See issue 22.071. It is important that the absorber is not “agglomerated” and is continuous. or IB IVI - See TDB, March 1971, P2O31. It) Continuous “money” ＋It shows a metal layer like an amorphous sub-layer, and the amorphous is a silicon layer. It's like a con. These layers (metallic, crystalline silicon, and amorphous 7. heated to form a mixture of silicon.

Such a package is placed on a ``triple layer structure'' forming such an ``island-like'' absorber film. It was entirely by chance that I formed the "minimum anti-rate" precipitate. If so, I would like such an OD to exhibit sufficient sensitivity and S/N over a long service life. It would not have been possible to provide a D record (see below).

By the way, as mentioned above, such "island" absorber films are somewhat different. The gold public The iron is clearly not heated to its stated melting point. It spreads dramatically and becomes a lump again. This is not what is expected by the literature! .

Many technologies hypothesize that a thin metal film will exhibit properties of the bulk metal. have been established. A few people have different characteristics (OD disc recording). I have said that the relationship (though not the relationship) would be different.

And engineers believe that such "island" absorber films (as mentioned above) ) I couldn't be sure how it would work on an OD disk. .

The technology is sonic that such island films can be laser written, Recognizing how amazing it is to form such an “agglomeration hole” Will. Rather, one should not spread the softened material at the writing position in such a way. One might expect that continuity of the absorber film would be necessary for For example, as the cited Z ech document assumes, the hit position cannot be derived. Expanding: Produces “surface tension” or “planar depression”).

“Record storage stability”: (resistance to environmental deterioration) Furthermore, it was found that the record storage stability is superior to that of tellurium record media in (This is superior to the previously known 11 tellurium recording media.) For example, ``Aging'' test under periodic stomach temperature/high humidity environment in optical reflectance If you monitor the changes, you will notice that this film is significantly better than similar tellurium films. You can see how stable it is. Technical sound velocity is gold film or the strict mentioned here. It is well recognized that new record-keeping system conditions are well suited for such gold absorbers. It was a big surprise that it was ``sensitive'' enough to be used as an absorber and weighed 1q. Ta. That is, in this case, the information is transmitted at 5-15 mW/10-100 nanoseconds (or 1 With an output of 00~1000p, J,), it is possible to sufficiently ``write'' on the gold triple world. It is possible. This is truly surprising: it exceeds the theoretically expected sensitivity level. It is much higher than Bell, and it is truly different from what is written or taught.

i.e. well-known and accepted ``good absorbers'' such as ``e'' and In comparison, gold (L) has a relatively high (bulk) melting point (approximately 1 063°C) and excellent thermal conductivity (that of 1-e is very poor: gold is the (belongs to high). Therefore, one can assume that the gold absorber is actually not (shows no sensitivity) , one would expect the sensitivity to be far inferior to that of tellurium.

That is, the literature praises tellurium as having significantly better sensitivity than titanium. Titanium has a high melting point like gold but poor thermal conductivity like Te. have.

So why is gold 1q higher as an absorber? (For example, Tel It has the lowest thermal conductivity of any metal, while the current thermal conductivity is about 10 that of Te. 0 times, and only CU and Ag exhibit higher thermal conductivity than gold).

One reason (see below) is that different writing grooves (“bit formation” or “writing”) ) may be related.

The related reason is the “island” form of the gold film as mentioned above. Not possible. To change the reflectivity of the film, a much lower writing energy than expected is required. energy, or write energy much lower than that indicated by the properties of the bulk gold powder. Obviously you need it.

Low temperature record: The big surprise is that the “´reflectance change” shown is at such a low (write) output level. and clearly occurs at such low temperatures (this symptom is around 300°C , which is considerably lower than gold's published melting point of 1063°C, which is For example, gold islands are deposited on a polymer and recorded on it. It has been confirmed that The melting point of Naginara's polymer is much lower than this 1063℃. It is the body. (See example one page below). It is like gold as an absorber High melting point'' materials (i.e. have good storage properties and therefore last for a long or lifetime) The technology is focusing attention on the speed of sound (materials that reduce risks such as corrosion and performance deterioration). I might let you.

Of course, the island structure of the film explains this apparently reduced melting point. Is it possible to clarify the problem, or are you able to move the unloading machine groove other than ``dissolution''? Maybe, but I'm still not sure about 3W. According to one theory, such islands has a high internal energy, so a relatively low writing beam energy can can cause their ``splitting'' and therefore the need to ``melt them'' It can be agglomerated without being agglomerated.

Anyway, Technological Speed obviously welcomes the availability of such a novel 1'gold absorber'. will. Because of the well-known manufacturing, precipitation, and handling In addition to ease of storage, excellent storage stability and computer disk recording Not only is the suitability for use as This is because the "modulation" of the fabric offers special and unique advantages in loading and unloading. For example, the absorber bit position may be changed to a conventional melting temperature r5. Well, there's no need to heat it up. ). Also, the reduction in write energy and recording temperature will be appreciated: These offer much less energy “laser writing” possibilities and smaller bits. Promises the possibility of writing to the area. For this reason, spacers (and any cladding) is a good thermal insulator with a relatively low heat capacity, as discussed below. considered to be the best case.

As in the case of the Te absorber in the above Te example, without the need for intense heat or macroscopic changes typical of melting (processing) (e.g. absorption). The system in which bits are recorded without requiring such a large movement of body ÷ 4 bits The stem will be welcomed by the technology Sonic.

Overcoating; Effect: In the "Te example", 5iO (100) is applied on the Te absorber film. It was like Baco 1-, but with a true functional override of the kind that Technological Speed wanted. Coat (e.g. remove dust and dirt from the surface; prevent the ingress of vapors such as water and hydrogen) Prevent; also to retain the heat of writing, without causing scratches. It does not provide a transparent polymer (a few inches long) that can be handled and recorded. It was. Although this 3iQ coat had no effect on "hit formation", it was necessary to You probably want to increase the energy by about 2 times, and it is possible to increase the TO film at the bit position. Holding down (probably because it obstructs the movement of the TO forest there).

Technical speed of sound (such as pips in TO and bubbles in other metals) It may also be inhibited by the ``processing records''). For example, if you expect that the overcoat will displace the absorber from the pit location. prevents any "ejector" from being removed. ).

However, when a gold film like Example 1 is similarly overcoated, such There was little or no disturbance, and the sensitivity was only slightly degraded. This is evidence that the bit formation mechanism of the taib is working.

This reinforces the idea that the instantaneous recording mechanism is entirely novel, and this The technological speed of sound will also be the same (the processing and movement of island materials will be Even if it is accompanied by a low-power write like (This is consistent with the above-mentioned ``agglomeration''). increases the attractiveness of such absorbers. This is because it affects overcoating. This is because not being affected is extremely important.

Loss of “bulk All” properties: Another feature, based on Example I above and others, is that such (gold) Iran film'° absorber has its reported ``bulk'' properties. (e.g., the radius of heat Directional conduction is important (it seems like it's yonaza). Such “island film characteristics” The findings are important and are discussed further below.

These "agglomeration holes" (anti-body J switches) are lower than the melting temperature of the absorber (gold). It appears to form at fairly low temperatures, which is associated with the exclusion of absorbers and little or It doesn't matter at all, and furthermore, the write requires much less write energy. It's good.

Typically, such island-like absorber films can be utilized to form OD disks. the technical speed of sound would be expected (e.g., without the requirements of Table I Instead of pure gold, the absorber is made of gold containing tin (deposited) with low resistance. Other than that, it is the same as Example ■. This is a laminate (lamina) for vapor deposition reasons. applied as: first gold, then tin, then gold (or two pieces of tin and gold) (Additional layers may be added.) By heating, this laminate 1~'' becomes an All/Sn composite. will interdiffuse to form gold (mostly gold and therefore the special properties of gold). %9).

This AU/Sn film is placed with the island film of Example I (15 in Figure 2). The effect is qualitatively the same as in Example 1. However, it exhibited excellent storage stability and somewhat inferior sensitivity.

Adhesion of 811: It should also be observed that the gold irlant adheres only weakly to the silica. (for example, can be easily wiped off). Transparent for better thermal insulation than 7C1 When replaced with a bright polymer spacer, the gold remains sticky with almost no adhesion. The arrival coefficient is O).

Therefore, thin tin strike 1-like (island form) A pre-deposition of This is formed on top of the glass and subsequently islands of Δ11 are deposited) . Polymer spacers were used later. As example ■ shows, the result (j, especially the point showed great promise on reamer substrates (gold adhesion was greatly improved; Moreover, the island structure did not change).

A clear polymer (e.g. Teflon) is used as a spacer to connect the tin flash. A "strike" (as an adhesion promoter) is inserted under the pure gold absorbent body. FIG. 5 shows that it is otherwise similar to Example I (FIG. 2). Therefore, the following As before, we have disk 212, the zapping date 212-S on that disk , then the reflector 213. Spacers (of clear Teflon or similar polymer) 214° and absorber 15 (island-shaped pure All: L or island 3 n layer 5T-F) of 3Φ layer 2-to-R. above this Written as before.

skin 1 Same as Example ■, but the adhesion, sensitivity, retention, and storage stability of gold (4) are greatly improved. It was. In other words, the gold (island) is the substrate (transparent bolin). -・Sn islands on the suberi) were firmly attached. Greater sensitivity and readout Once improved, this 3n strike improves adhesion (to polymers). It is thought that it not only works to improve the optical readout, but also to enhance the optical readout. That's really surprising.

One such surprising optical effect is shown in Figure 7, which shows that it depends on wavelength. This is the reflectance (and refractive index) of a virgin island film. Example I A pure gold island absorber has a change in refractive index and curvature as shown in curve A. It shows reflectance/λ characteristics like line B. This is clearly)-1e-Ne laser beam This shows that it does not work well above or below the spectrum (to 6338). For example, the necessary formatting of an OD disk cannot be performed with a 4400△ etc. (and it is not feasible to use a Qa-AS relay instead). totally surprising In particular, if a Sn (island) strike is applied, as shown by curve C, In addition, it acts to ``flatten'' the reflection curve of the absorber.

As the technology increases, so do you realize how important the width of the Iζ radiation zone is. Dew.

Example 1 (Si 02 soil pure A (1) has slightly insufficient record keeping properties (for example , J3 is insufficient in resisting water vapor ingress; this is probably due to very weak adhesion. depending on gender). On the other hand, this Au, / S n, 7-field structure is far superior. ing.

Of course, poly7- is highly thermally degraded (Sn), followed by △The deposition step (for l) can be kept below its temperature limit (~100°C) . Such gold films can withstand "archival" conditions such as those described here. It must be. Such “gold records” must be kept under typical conditions of storage and use for which they were intended. Under this, it is possible to maintain a suitable succession (30+dB>) for on the order of 10 years. ■ The designed example is reproduced. However, as a protective overcoat, its absorbent layer A clear polymeric supercoat is applied over 15.

Result: Same as example (■) except for a slight deterioration in sensitivity, so it passed the test.

Such tolerance to overcoating is a remarkable property: This is highly desirable.

彷v: @■ and i leather, alloy or co-deposited: same small%) that the tin is deposited simultaneously with the gold (rather than as a preliminary "strike"). Other than that, it is the same as example liver.

A thin layer of $102 is superimposed on the polymeric spacer 214 (Figure 5). Other than that, it is the same as Example ■, and a 3n strike is landed on the 5iOz, and then gold is landed. is deposited.

Ll: Same as Example ■, but the sensitivity was significantly reduced.

Although such polymeric spacers are viable, silica or (widely reported as favorable) is a surprise to Technological High Speed. Dew.

Example ■: Au/Sb: Tin (strike on polymer and on 5in2) is replaced with antimony This is the same as Example ■ except for.

il: Although the sensitivity is better than the previous example, the recording stability is very poor, and it is also surprisingly It should be noted that the “ejected” globules (see Figure 4 e; in this case, compared to the light example) In-hole agglomerations and ring agglomerates (see figure W54; Each element 1. r).

Figure 4 shows the shape of the Rika type that is injected onto such an A　u　y'S'b absorber. The “agglomeration hole” is idealized and the “virgin” island arrangement V is shown here. It is not shown.

The latter properties (prone to forming rings and localized agglomerates rather than ``ejecta'') is impressive. It also shows the possibility of controlling the light of the movement of agglomerates. In addition, overcoat (which is expected to prevent all ejecta) This suggests a hole formation profile that is minimally affected by heating.

Co-deposition of such a Δu,/3b alloy (on the same two occasions) shows similar results. Probably.

Example ■; Au /3b /3n: The 3n strike is followed by an antimony strike, followed by gold evaporation. Example ■ (Sr + strike is applied on the polymer) except that it is worn The same is true.

ILL' It is almost the same as Example ■, but the sensitivity is slightly inferior and the storage stability is poor. In addition, there is a tendency for there to be fewer ``ejecta'' (as shown in Figure 4). , but slightly more than Example ■). All-3n-3b's simultaneous drinking and snacking results are the same. will occur.

Example IX; Pd: Palladium or gold may be substituted and the nubstrate may be made of clear polymeric material. This is the same as example (■) except that it is a server.

Result 2: Almost the same as Example I, and as in Examples ■ and ■, there was generally less "ejecta" ( ``rim agglomerates''° seem to be a little more numerous).

Same as Example ■ except that Pd is used instead of gold (1) d is a polymer (deposited on the 3n strike above).

Results: Same as Example ① except for excellent record keeping properties. Or similar to example ■ (For example, increased bandwidth.

Resistance to vapor infiltration, as well as associated dislocations of virgin Au islands, etc. ).

Example XI; All/Pb laminate: It is the same as the example revision except that tin is replaced with lead, and absorber film 15 (No. Figure 2) consists of a series of island layers of gold/lead-Imaichi lead/gold, each layer being It has an island structure. When heated, these island layers easily interact with each other. Diffusion (the distance M is very short) to form A u , , / p h alloy islands Form. Since AU is the main component, the properties of Pb can be ignored as a first approximation. Ru. Therefore, the alloy will exhibit primarily the properties of gold.

Film 15 was deposited as a “laminate” for testing convenience, but Other methods may be possible as well.

[Note: The “laminar” form of this alloy is simply a matter of preparation and polishing. selected for convenience of research. However, once the alloy conditions are settled and optimized, , high speed techniques can be obtained by sputtering or other known reliable methods in high vacuum Deposited by “co-evaporation”, a method that allows the realization of more homogeneous alloys. would prefer to do so. Such a thin film may be slightly uneven. There is that.

Therefore, it would not be suitable for most applications. Compared to, for example, the simultaneous evaporation 'A' position, it is impractical to proceed on the basis of a first approximation. Always fast and cheap.

and can be carried out conveniently. ] Ll: Not only as mentioned above, but also as shown in Figure 11 etc.) Rather, except for the fact that it precipitates in a pseudo-discontinuous form in the form of filaments, This is the same as Example ■. This is shown in Figure 10 using an electron micrograph at a magnification of 100,000 times. and is shown idealized in FIG. 8 with the C1 pair of spaced upper electrodes. There is. This °゛pseudo-island°゛　 (“island-like” or “peninsula-like”) form is "Agglomerate" in the manner described above, such as in Example 1, It forms small spheres that are discontinuous (“pseudo-pid°”). It is thought that the same applies to However, these filamentary peninsulas exhibits a much lower lateral electrical resistance than “islands” such as Example I (and However, the resistance is quite high). Additionally, they write “agglomeration holes” and Functioning similarly, they maintain the same 'thermal insulation' as the 'islands' mentioned above. It is thought that it has.゛Such filament as well as island shape The shaped structures can also be characterized as "island-like". It's like other ゛° insular rough In the same way as a lume, an "agglomeration hole" is formed and recorded.

In this case, the sensitivity is the highest and is (9) lower than in the case of pure gold (Example I). It has a "sensitivity" that is roughly equal to that of tellurium absorbers, and is often superior to it (for example, For example, about one-half of the sensitivity of the "Te example" may be measured). Straw, in this case 5”□ 15 In W, / 10-100 nanoseconds (or In the output range of 100 to 10001), , j, ), information is transmitted to the gold/lead triple layer. can be sufficiently ``written''. More specifically, about 40 nanoseconds A "change in reflectivity" can be seen with a short period of 5 mW output. In some samples "changed" by a power of 1-2 mW for about 10-15 nanoseconds; other samples Then, at 101 nW, it shows a change in a relatively short time. In either case, sufficient readout ( For example, 30 to 40 dB of S,/N). This (very surprising) The sensitivity level is many times higher than that predicted by theory and is in line with what would be expected from the literature. is completely contradictory. However, its record keeping ability is very low. For most purposes, it is not as acceptable as worn Au or U-3B).

Also, relatively small ``ejecta'' are observed as in the case of Au/Sb.

1st river: Some of the results of Example 1-XI are shown qualitatively in the following table. compared to. Now, assuming similar construction and operating/test conditions, we will Remove the server coating. [Note: S'\l is sensitivity, AI V is storage ``rim'' ``ejecta'' refers to the possibility of rim or ejecta formation (e.g. 1°”.

°°2°” means “best”, “second best”, etc.; X× means “ Indicates 'unavailable']U and grab hold hold hold part μ small Au/Sn/sb mark l barrel S’Y: 4° 5° 　l’　2°　3°　4゜A’y:　4°　l’　5 Both 4. , x3°　3゜x Rida Low Low High High Medium High Ejecta High High Low Medium Medium Low So, for example, one general teaching here is the aforementioned “trilayer structure”. In the production of OD disks with absorber films, the absorber material is By applying it to the land shape, surprisingly good sensitivity can be obtained. . In addition, for example, in order to extend archival life while ensuring good sensitivity, or noble metals such as palladium or their alloys can be deposited as absorbers. What's more, the gold-like island film absorber is amazing! to increase reward Can be combined with ingredients such as lead or antimony (e.g. in small percentages) , and also to improve archival properties and optical properties (e.g., large hunt width), such as tin. It is also possible to combine it with eel ingredients.

ΔAlso, by combining gold or uvaradium with other ingredients, It is possible to have some control over the collection mechanism (e.g., if there is In other cases, ejecta are dominant, and At++Pb or P(1+ S mouth minimizes the possibility of "ejecta", 80 + 3 II + S + 1 is S'y , A'y, increase bandpass and reduce ejecta. ).

Also, combining gold with lead, tin, or antimony This improves adhesion (to the absorber and spacer) and prevents moisture intrusion at the absorber-spacer interface. It seems to increase the IF -1, that is, record retention.

Technological high-speed technology is developing electronic beam recording and IR recording for such absorber films. You will notice a similar method of recording ponds.

``Rashata film'' opened by heat: Figure 9: Figure 9 shows the subject of ``irradiation conglomerate''. This is a clever illustration of another application of Island film. here Then, the island film (ab, ) is attached to a suitable substrate in the frame member r. (e.g. transparent polymeric acid as in the example above) 80 or Al1 alloy on glass with Bacote). Radiant energy source 1-3 ( For example, an irradiation beam b is applied continuously (or periodically) onto beam ab.

Initially, the film ab repulses most of the beam b1, e.g. film a1), a film a1] ( The temperature of the stomach (the area above which the beam touches) reaches a predetermined level by the LS. When it is brought to agglomeration temperature (for example, by a nearby fire or flame), it is agglomerated (for λ1 of b) and “transparent” J (thus film ab appears relatively transparent to λ1). Thus ab passes through beam b1 and the related The transmitted beam D2 becomes suitable for detection by the second detection device D2.

Source 1S may be stationary, usually directed towards device D21\, and its initial A hole is formed in the film ab by the irradiation energy beam b,).

or alternatively, beam b1 is scanned across film ab to Kuhn may be “written”. Also, in the case of immovable BL, the entire etched “mask” The source of the radiation source may be from the rear of the body (for example, a display (to make a ray or optical printing plate). Technique speed of sound is other Similar applications may come to mind.

Example of change: The technology is sonic that there are such °'island' (or 'island-like') films. In some cases, other metals or alloys thereof (e.g. Au or other 2-5 alloys of PD) may be used. gold, ternary alloys, or other metals such as pt, Cu, △o, Rh) Can be combined. In many instances, the absorber film t, t, antireflection or a similar optical substrate.

In other examples, such island films may be techniques (evaporation is very practical, as in Example 1, it is possible to (can also be used to deposit the associated layer of). “Go For gold, co-evaporation is usually preferred.

Other methods are also possible for depositing the absorber, such as sputtering.

In any case, it is usually necessary to control the island groove path during precipitation. It is advisable to monitor the film.

11: The preferred embodiments described herein are merely examples and the invention departs from the spirit of the invention. It is possible to make various modifications and changes in structure, arrangement, and usage without being affected. It will be understood that

The invention is capable of further modifications. For example, the means and methods mentioned here also , other ultra-thin films used to be optically switched when properly illuminated. Applicable to films.

The above examples (which are merely illustrative) of possible variations of the invention; therefore, the invention including all possible modifications and changes within the scope of the invention as set forth in the appended claims. It should be considered as a thing.

FIG, 3゜ FIG, 7°

Claims (1)

[Claims] 1. In optical data recording systems, a combination comprising the following: optical recording medium. A means for providing recording radiation of a prescribed wavelength. Gives the prescribed minimum write energy according to the given data Means for adjusting said irradiation. means for focusing a regulated illumination of the prescribed beam onto the recording medium; . to provide relative movement between the focused recording beam and the recording medium; means of. The recording medium is used for reading with a similar radiation beam, but the radiation beam is the reduced output level. The medium is deposited in an island shape. at least one ultrathin discontinuous layer of absorbent material containing gold; The bud is applied to the recording medium at the prescribed bit position at the one-input energy level. is "agglomerated" by giving a changes its optical properties and is detected by associated readout means. Said island fee The beam has a distinct separation of absorber material with an average width significantly smaller than the width of the beam. "Island Pa" is shown. 2. A read irradiation beam having a predetermined wavelength and width corresponding to the recording beam. The invention as claimed in claim 1, further comprising means for providing a light beam. means and said means for imparting relative motion, each of which has successive images on said medium. It is used to focus the beam and to provide the relative motion. of said medium The change in optical properties between the focused reading beam and the medium The light reflected from the medium during the relative movement changes according to the so-called data. selected and employed in relation to the energy level and wavelength of said reading beam so as to be done. Further, the reading energy level of the reading beam is such that the reading energy level of the reading beam is indicative of the optical change. . It is chosen so as not to significantly affect the subsequent readability of the data. 3. In an optical data recording system, a combination comprising the following: having data recorded thereon as an array of optically detectable changes in said medium. optical media. to provide a read illumination beam having a predetermined wavelength and writing energy level. means of means for focusing the read beam onto the medium; means for imparting relative motion between the focused reading beam and the medium; The medium comprises at least one of the first gold absorber material deposited in the form of islands. comprising discontinuous layers of layers, said discontinuous layers having a prescribed Iζ bit of said medium; By applying the read beam at the write energy level to the ” then receives the prescribed sensing by the associated reading means during said movement. as it takes, detectably changes its optical properties. The layer may be one or more absorbing layers. showing clearly demarcated islands of body material, said islands being adjacent to said beads. It has an average width that is considerably smaller than the width of the gam. 4. Directing the data-adjusted and focused writing beam onto the medium for recording irradiation. A prescription for drawing data bits by giving them to and at the same time giving a relative value between them a light beam in which the beam may be data-modulated to provide pulses of written energy; Optical media used in scientific data storage systems. The medium is an absorbent material of gold or gold alloy deposited in a discontinuous island shape. at least one layer of material, said layer being capable of applying said beam pulses. ``agglomerated'' at the prescribed bit position on it by in order to be able to read out during said movement by associated optical sensing means, We will change this so that it can be detected optically. The width of the island layer is greater than the width of the beam. to show clearly demarcated “islands” of absorber material with smaller average widths. It is formed like a sea urchin. 5. Any claim stated in any one of claims 1 to 4 that includes the following: invention. The irradiation is from a laser source. The medium is a reflective layer, the reflective a transparent dielectric low thermal conductivity spacer layer overlying the layer; and said spacer layer. It consists of several layers, including an island-shaped absorbent body overlying the the layer The thickness and optical properties of the absorber layer and the optically detected changes in the absorber layer are relevant. is selected in conjunction with the energy level and wavelength of the reading laser, so that the focused During the relative movement between the read laser beam and the medium, the read laser reflected the read beam from the medium, which changes the read data accordingly. The intensity of the reading beam significantly degrades the subsequent reading characteristics of the altered optical properties. Selected to avoid being overshadowed. 6. The absorber island layer is not deposited by evaporation from the melt in vacuum. The invention according to claim 5, characterized in that: 7. The overall thickness of the absorber island layer is several orders of magnitude. of the order of angstroms or less The invention described in item 6. 8. Claim 7, wherein the spacer layer is made of a polymer. The invention described. 9. The medium has an antireflection base on which the island layer is deposited. formed by the non-recorded portion of said medium, and thereby prescribed Any one of claims 1 to 4, characterized in that it exhibits a minimum reflective layer. The invention described in the section. 10. Allow the island layer to deposit until it exhibits the prescribed initial minimum reflectance value. The invention according to claim 9, characterized in that: 11. The island heat is formed by welding while its reflectance is monitored. The invention according to claim 10, characterized in that: 12. The island layer is deposited on a dielectric material with very low thermal conductivity. to retain the writing energy incident on the pips 1 to 1 position during such recording. is used to heat the absorber material to its bulk melting temperature. Claims characterized in that low power/low temperature recording is possible without the need for heating. The invention described in any one of paragraphs 1 to 4. 13. The average size and average spacing of said islands will vary during such recording. ° “Agglomeration” allows significant reflectivity at each recorded bit position. A claim characterized in that it is selected and used to be shaped to cause a change. The invention described in any one of Items 1 to 4 of the scope of the invention. 14. The island layer causes such changes during recording, and furthermore, the recording bit characterized in that it does not require the removal of almost any absorber material from the spot position. The invention described in any one of claims 1 to 4. 15. The island layer is covered with a protective differential focus overcoat. and is further deposited on a transparent thermally insulating polymer that serves as part of the anti-reflective base. According to any one of claims 1 to 4, the invention is characterized in that Inventions listed. 16. Medium as an optical data recording medium used in an optical recording system manufacturing method. The system uses a predetermined wavelength and prescribed writing energy. a regulated laser writing beam, the beam being focused onto the medium; , while relative motion is provided between the beam and the medium. The method is Includes the following steps: providing a reflective support means with dielectric spacers (2) prescribed thereon; step. one or more absorber layers in the form of islands on the spacer layer, Depositing at least one of these layers to include gold. The thickness and optical properties of the layer are such that the anti-reflection state of the medium at the writing wavelength is Selected to predominate in unrecorded areas. Furthermore, the thickness and optical properties of the layers are selected as follows. The writing beam The data adjustment prescribes the write energy to selected bit locations of the absorber layer. gives a write pulse. Irradiation to each such location is performed using anti-reflection coatings at that location. to detectably alter the state of the change the characteristics of 17. The absorber layer is formulated so that IC low reflectance levels are first detected. 17. The invention according to claim 16, characterized in that it is deposited by vapor deposition. 18. Method for preparing a recording blank for improved irradiation recording . According to it, the information layer is placed on the substrate means, and the prescribed By providing a writing beam of optical energy with 1 energy and wavelength, the digital The method used to record data bits includes the following steps. a relatively minute thickness of primary gold "absorbent material" formulated onto the substrate means; A tube in which the material is deposited, thereby creating an array of isolated “islands”. A discontinuous recording film is formed having a specified and prescribed initial reflectance. Said The film appears ``optically continuous'' to the writing beam. , it is possible to apply such a single beam to the "hilt position" in the recording film. applying prescribed write pulses of said one-input energy to possible and selected locations; The data can be adjusted to This causes a prescribed "agglomeration" of the absorber islands and optically discontinuous, and an optical hole is drilled therein, thereby transmitting the data. changes in the sensed reflectance of each writing position represented. The absorbent material is The deposited material is selected in conjunction with the surrounding optical/thermal environment to cause "agglomeration". It will be done. 19. The substrate means is an optical anti-repulsion base comprising a thermally insulating dielectric surface. the absorber material until it exhibits a prescribed low level of initial reflectance. 19. A method according to claim 18, characterized in that the method is evaporated. 20. Gold or gold vapor deposited until the absorber 4jJ material exhibits the first initial reflectance. Claim 1, characterized in that the main part of the absorber is made of gold alloy. The method described in Section 9. 21. A small amount of metal used to improve the adhesion of the metal to the dielectric surface. Claim 19, characterized in that it is combined with at least one other metal. Method described. 22. It uses a low-power recording irradiation source and has a relatively long storage life. method of providing recording blanks for use in The radiation source consists of a given wavelength and Provides a writing beam with relatively low writing energy. The method includes: having a recording portion exhibiting prescribed optical and thermal properties at a given wavelength consisting of Substrate provision. Application of a formulated information coating onto said portion of said substrate. this The material for the coating comprises and comprises at least one absorbent metal. selected to exhibit the prescribed absorption power and “early reflectance” at a given wavelength. The prescribed reading pulse is received by receiving the write pulse of the write energy. Fl$　” It can be changed up to. This is at the prescribed pavit location on the coating. The one recorded is gold or gold alloy. This information coach ink is divided into dimensions and spacings to indicate the prescribed early reflectance. 1 island formed by 1 win (U) or more ultra-thin discontinuous island It is precipitated as a de-xi. In addition, the power is collected by applying the write energy pulse. agglomerated, and said successive reflectance levels (which produce changes in reflectance). As a result, detection is better than in the unrecorded #4 region, which shows initial reflectance. Gives a cursory reading contrast of 1-. 2:3. The substrate is formed to be 1F reusable and have very low thermal conductivity. The information coating metal has an initial reflectance of °゛initial minimum reflectance''. A relatively small number and widely spaced "eyes" are deposited deep enough to produce Claims characterized in that the invention is used in an agglomerated manner to form a land. The method according to paragraph 22. 24. The substrate note includes a dielectric spacer and an underlying reflector surface. The metal island layer is layered on top of these to form a triple-layer structure. 24. The method according to claim 23. 25. The substrate is made of a polymer with low thermal conductivity. The invention as set forth in claim 23. 26. Ultra-thin island coating on the polymer prior to the gold island layer A “strike” layer is applied to improve the adhesion of the gold island layer. The invention according to claim 8 or 25, characterized in that: 27, The polymer is made of polytetrafluoroethylene, and the a first gold which improves the adhesion of the first gold islands to the polymer; The invention according to claim 26, characterized in that the invention is made of a metal that is not.