JPS59500992A - Island-shaped thermally permanent recording 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] “Iran suitable for digital data storage using low power writing lasers” The present invention relates to a novel high-density recording information storage medium. relating to such media particularly suitable for recording by low power laser means. It is something.

Background of the invention Optical storage of digital data is a relatively new technology1 that uses optical technology. Regarding the digital information 0 storage 8 erasure 1, the ODD (optical digital data) data using associated special media such as discs. Traditionally, it has been considered similar Such data is compatible with the data commonly used in today's high-speed digital combi coaters. 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 in the technology Sonic depends largely on the recording medium. How is the technical speed of sound in this technology? Development of satisfactory DD disk media, especially suitable for currently available low power lasers We have struggled from time to time 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 N special table 1986-500992 (4) Used as archival storage in computer systems and as such. This indicates something that will be used for a long period of time.

Recording medium suitable for the irradiation beam; - Crotch: The conditions for such an ODD medium are strict. For example, high bit densities, cost-effective information storage, sufficient Write/read speeds, and preferably the use of low power lasers, etc. are relevant. (Technology The speed of sound recognizes the simplicity, speed and ability of performing such a process, For read/write operations, the laser beam need only be modulated or deflected. ) In related applications (e.g. video disc recording), the technical speed of sound is was used. And in their configuration, a metal film is used as the "information layer". The medium used was presented. This layer has ``voids'' (bits) within the layer. write rape bits to form holes (cuts, holes, bubbles, etc., or other processing). Softened and melted by the foam.

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

Certain technologies show that the speed of sound is such that such laser recording can be used to record various computer records (e.g. They felt that it would be promising as an ODD medium (mentioned above), but they decided to develop an actual system. awaits a recording medium that responds to low-power laser writing, and thus this Discover information layers (materials) that can be melted (or evaporated, etc.) at extremely low power levels. I expected that it would be a matter of whether or not. This also means that its associated system It will also depend on the irradiation efficiency.

Therefore, the technical speed of sound has a high "thermal efficiency" (how much of the heat generated at the recording position is A measure of how effectively a protein can be stored locally to form a "human" ), we have continued to search for such laser recording materials. For this reason, they 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.

Also, the speed of sound technology requires that low-power lasers be used for such recording. For example, I feel that I want to extend the operating life of a laser device and reduce its cost and size. (to make it smaller), the metal selected for such an information (absorber) film is It is further desired that the material has an exceptionally low melting point (moderately high sensitivity); The “pit/void” claimed by this is formed with the minimum laser power and 1 q is desired.

Te absorber film: Currently, many technical sound speeds are used for this laser recording or related laser recording. We are implementing the use of Te absorbent film. There are several reasons for this be. Tellurium has an attractively low (bulk) melting point (approximately 4.50°C) and is a good thermal conductor. seems to be able to provide good sensitivity and signal-to-noise ratio, and furthermore it is thin It is relatively convenient to deposit as a film. Bismuth is also commonly used for similar reasons. has been proposed. Also related alloys (e.g. 7a-Qe).

Te-AS-8e and Bi-3e) were suggested in No. 1 as interesting. came.

Tellurium has a relatively low heat dissipation property, and compared to, for example, aluminum. It has been thought that all write thresholds and energy levels are low. Ta See, e.g., U.S. Pat. No. 4,222,071 to Be11 et al. , Vol. 177, OpNcal Information St.

rage, 1979. "Revicvof" by Zech from page 56 onwards See also ``Qptical Storage Media''; further 5PfE, VOl, 123.0ptical 3torage MateriaIs and Methods, 1977, by Bartolini, pages 2 onwards. See also “Qptical Recording Media Review” Do it.

For example, this 13 artol i old editorial describes other optical recording means of class 10f4. and discuss such absorbent films (“processable thin films”). They are known to undergo photochemical changes accompanied by changes in their refractive index. Contains "optical polymers," which are organic compounds that Z ech's editorial is It is arranged and used so that a 1" bit" is formed on the absorber layer by laser writing. This bit of information (similar to the Bell patent) ) detected by changes in reflectance.

In such well-known "processing records" a high intensity radiation beam (laser) is used. Thermal energy imparted by the ``writing beam'' of the At least a portion of the beam cross section may be melted or processed. cormorant. Many people believe that surface tension then causes the formation of "planar pores" ( (see the editorial by Z ech cited above), which are usually slightly oval in shape. This results in the formation of pits or holes. (Cocl) ran and Ferrier Ni By “Melting l-1o1es in Metal Films fo r Real-Time, t1 igh [)enity [)ata 3 3 PI E P roceedings, 1977 August 2017, [-'17~See p.31] Absorber film: One of their features is that a related type of laser recording is that is, up to the melting point of the bulk I have discovered that you can do this without heating the position. And as a result, comparison a high melting point and a rather high thermal conductivity (these characteristics are useful to engineers for this purpose). Materials such as gold, which have been avoided due to It forms a film, compared to the hitherto preferred absorbers such as tellurium. I've also found that it's all about the sensitivity you get.

Of course, those made of titanium, gold (also platinum, rhodium, nickel, chromium, manganese, and vanadium; e.g., U.S. Patent No. 4,285,0 to Beil No. 56 or IBM's TD Bulletin, March 1971, No. 30 "High melting point" materials such as I had a vague guess that it might happen. However, such Speculatively, the actual problem of "sensitivity" or how to those materials as mentioned above No attention was paid to whether low-power lasers could be used to record . Alternatively, those assumptions have ignored related thermal conductivity issues (thermal is conducted radially to the recording position f), the writing energy is consumed, and the sensitivity decreases. becomes worse: Metals like gold have high thermal conductivity, but King 1 and Te do not. ).

Up until now, observed sound velocities have generally shown that "high melting point" metals are unlikely candidates for absorbers. (For example, as stated in cited U.S. Pat. No. 4,222,071) As shown, 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 as gold can be used. possible and at least known absorbent materials, such as those with very good archival longevity. This shows that it can function in the same way as an absorber with an absorbency equivalent to that of Te.

The invention further provides that such an absorbent film (contrary to what the prior art teaches) ) that bit position must be heated to the traditional bulk metal melting point for recording. Clearly show what is unnecessary.

Extended archive field ω: A major attraction of optical data storage technology is the increasing availability of storage technology (e.g. 10,018 orders of magnetic tape). The machine intended here optical data discs with extended recording lives on the order of 10 years or more. It would be expected that additional "'non-erasable") information would be stored in the meantime. . Such an extended lifespan is a goal that has not yet been achieved with conventional technology. The spirit sincerely desires to do this. The present invention provides such records 4 The promise of life-indicating media, especially those used in optical large-scale memory and such applications. do.

In contrast, commonly proposed absorber metals such as bismuth and tellurium are less It is known to oxidize quickly and otherwise are known to easily degrade in performance; therefore, they unsuitable for record keeping (e.g., ASh et al., cited later, 19 1981; and Zech's editorial; further illustrated by Example I, discussed below. ). Engineers believe that tellurium has particularly poor storage stability. It is recognized that the successive signals deteriorate in a short period of time. This deterioration is high Typically promoted under low humidity environments: rapid overall light transmission. (probably due to the general oxidation of the metal), and also that gold Due to severe corrosion starting at the "defect location" of the selected bit location in the It is characterized by And so is bismuth.

Extended archival stability is evidenced by this development indicating similar utilization of absorbent films such as gold. These monthly interest rates are explained by C. Ming. The use of such optical data for computers, especially (as shown in Table ■) It has excellent storage stability and stability when used as a disc recording.

Therefore, as a novelty feature, I use such products for records that exhibit a long shelf life. The intention is to use eel materials. That is, such materials Resistant to oxidation or deterioration caused by such atmospheres during storage or use. This is what is happening. Therefore, over an extended storage life, reading Erasing recorded information by maintaining sufficient reflective stability against However, this alone does not require the actual storage media or related This is a problem if the system cannot provide the It is. The invention will be described hereinafter in this regard.

The rT)ll recording medium and associated deposition techniques presented here are generally similar to those described above. Criteria (in accordance with (Ash and "Q physical properties of Te" by A++en lurium Films Usecl ror 1) ata Recordi ng”, 3 p l l:: pr.

ceedings, 01.222, 1980; and Rancourt 6°[)sign and production of l-elluri umOptical [) at: a [) 1sks”, S P I E ProceCdingS.

Vol, 299, 1981. See. ) Pain I (medium 1 μ” 口艷dan encounter”) 1. High sensitivity: Allows recording by low power laser means. ``Sensitivity'' is determined by bit formation (spot A change in fouling performance, caused by holes or other voids in the media or the like. such as those resulting from the formation of changes that give adequate readout at the intended readout speed. ) is understood as the minimum laser power required for According to the invention, typical on the order of 5 to 15111 W for a time of approximately 40 to 60 nanoseconds (pulse duration). It is possible to "write" with laser output.Moreover, the read-out waste (W! return reproduction) It is not degraded by

1-A, High S/N: (adequate readout): about 30-40d against RAM noise M in of B, on the order of the peak signal (with respect to noise for proper readout) 91st signal.

2. ``Record storage stability °''; (life span of 10 years or more) 2. 10 to 15 years without falling below the minimum readout (minimum can be used or stored while maintaining the same S/N ratio.

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. 10-6 Raw bit error rate ″′) below.

4. Possible to deposit”: Suitable films can be deposited on a “commercial scale” with reproducible and controlled properties. show.

5. "Overcoat possible": Absorbent film can be overcoated (e.g., up to a few thousandths of an inch), and the above features can be sacrificed by scraping. for example, still give adequate readout and protect the film mechanically. and protects against "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 is. A more specific purpose may be ``Island'' or such unrelated The purpose of this study is to demonstrate the deposition of continuous forms of gold and such absorbent (information) films. too Another purpose is to provide extended record keeping as well as good performance suitable for low power lasers. The goal is to present a film that exhibits a high level of sensitivity. Yet another purpose is The purpose of this invention is to demonstrate the preparation of a recording material suitable for recording that does not require ``dissolution'' of the information layer. : That is, the reflectance is modified while keeping the temperature below the melting point of the bulk of the recording material. Formation of bits (bits).

Brief description of the drawing These and other advantages and features of the invention are set forth below in conjunction 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-sectional view of one example of the performance of a new preferred recording medium illustrating the structure according to the principles of the present invention. It is a front view.

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 recorded bit positions.

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 reflectance for two embodiments.

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; (Pa control): Figure 1 shows the ideal optical recording medium 1. is a schematic illustration of a cross-section that has been visualized, usually in the tellurium literature (e.g. Ast. 111flE produced according to the method shown in + paper) It is. The medium 1 is provided with a support 2, on which is mounted an "anti-foul" base A and an information layer ("absorber") 5 on the AR.

Preferably, the base ΔR includes a reflector layer 3, and a transparent “ 'A spacer layer 4 is placed thereon. Layers 3 and 4 are intended follow-on/write waves, respectively. can be characterized as first-order reflection and first-order transmission at long distances. Layer 3°4.5 is As is known in the prior art (Ash paper), most of the visible spectrum It will be appreciated that the Dew.

Preferably, the reflector 3 is aluminum or the like, while the spanner 4 is transparent fused silica or such transparent dielectric, approximately 1/4 wave 1X 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 a few thousand) rpm, and Good surface smoothness (e.g. less than 4 x 10-' inches peak-to-peak) It can be understood as a gradual change in

A radiation (laser) beam of controlled energy and wavelength is directed from a laser source onto the medium 1. to form a ``bit'' or such ``process'' on the layer 5, (e.g. at the 'V' position shown in phantom).More specifically, For example, a 10 m W with a diameter of 0.8 μm (i.e. 8000△ or 1/Σ) Using a Gaussian beam, scanning at 45 m/sec, 0.8 μm width A minimum length of ``bit'' (not necessarily circular or other controlled shape) However, this condition is (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, a metal recording film 5 is deposited on a ``transparent'' dielectric spacer 4; The thicknesses of both are chosen to form a structure of known low reflectivity (e.g. 13 artol ini editorial; less than 3% reaction when recording at λ-488nm (obtained by 5qm of Ti on S + 02 spacer with radiation of 8Qnm).

Next, when each ``bit'' is recorded, this ``anti-reflection top and bottom Processed to form 4 'bits' suitable for high contrast reading . and if the recording wavelength is changed, the space should be adjusted to obtain similar results. The thickness can be easily changed. This "triple layer"' or Padark mirror ([) The surface reflectivity (on the absorber 5) in the “ark M1rror)” structure is “ to zero” or a value selected by adjusting absorber thickness and spacer thickness can do. Here, the "P3 layer" has an absorbent material on one side and a It can be understood that it consists of a transparent spacer with a reflector.

In some cases the technical sound velocity may be omitted (e.g. electrical mirrors”), as well as spacers 4 or other materials and structures (e.g. It will be appreciated that it is formed from several insulating layers of similar materials).

So here the coating parameters are such that the writing beam hits this absorber layer. When the light is focused, the so-called disk of the rod is tuned to the intended recording frequency. [For that matter, Llal '4jlJm E 1 electronics, VOI, QE 14. No , 7, JutV, 1978. See J:; Regarding general prior art, see: See the typical literature: 13 'Qptical by artol ini et al. [) isk 3 systems Emeroe”, IEEE Spectrum.

△gust 1978. p, 20; and “Qpt” by 3artolini ical Recording fvledia Review”, 3P IEp roceedings, \10f, 123, 1977, l), 2:” 0ptical 5toraoe fvlaterals and Meth ods”, SPI E Proceedings, VOI, 177.0p tical ■nformation 5tora9e, 1979. p, 56°] Preferably, the deposition is such that the reflectance of layer 5 reaches a predetermined reflectance level. The process proceeds by thermal evaporation until

As the technology knows, this can be done empirically, or by layer When 5 is precipitated, refer to the precipitation technique described in the frequently cited Zech literature. ) Continuously monitor the reflectance of the absorber film (e.g. on a reference specimen) or by similar suitable optical techniques for precipitation monitoring. It is also possible to use other commonly known methods such as monitoring the deposited mass. This is also possible depending on the electrical characteristics.

Thus, depositing an opaque layer of aluminum 3 onto the coated disk 2 (selected with respect to the Rede spectrum of all optical properties).

Next, a layer 4 of SiO2 (fused silica or such a "transparent" dielectric) is applied to layer 3. is deposited on top to a controlled thickness, this thickness being at the operating wavelength λ. related to Here, 1/4λ. or 3/4λ. is slightly smaller than either ).

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 illumination from the writing laser [-] at each bit position II V I+. If modified by the radiation beam and detected by appropriate means, the "void region" V (i.e. Pabit Pa) is relatively high Pa as is known in the art. A ``non-void'' background of low reflectance around it as a ``spot of reflectance'' It can be identified from the

For example, U.S. Patent No. 4.285.056 to 3ell describes such a medium. where the holes are recorded as holes in both the absorber layer and the transparent spacer layer. and the length of those holes and the unexposed area between them is the circumference. It is varied along a particular information track that conveys wavenumber information. 1 for this patent There are also various types deposited using conventional evaporation techniques or electron beam evaporation techniques. materials (e.g. titanium, rhodium, platinum, gold, nickel, chromium, manganese) , and vanadine). In comparison, in the United States, K. Patent No. 4,183,094 discloses a method for making interference changes without forming such bits. describes laser recording on Te-Ga-8e-8 material, which results in "oxidation".

However, Be1l's spacer layer is heated by the writing beam. This differs from the intent of this case in that it is necessary. wife , the spacer layer itself has to be scraped to be removed, otherwise (to form voids in the The top layer (e.g. gold layer) must be heated and removed to create a ``bubble''. It is necessary to generate enough gas to achieve this. In this case, essentially the beam energy lugi need not be absorbed by a similar spacer layer.

Tellurium is a ``low melting point/low conductivity'' metal that is generally favored by engineers because , it shows excellent sensitivity and therefore the required (threshold) laser writing output This is because it is thought that the force is small.

For example, this idea is illustrated by Beil and [3 artolini U.S. Pat. No. 4.22] No. 2,071, where a similar tellurium film was written on it. Characterized as requiring a laser output on the order of 15 mW to penetrate (This assumes an optical efficiency of about 20% to achieve adequate successive outputs.) The goal is to reproduce the recorded video signal with an S/N of approximately 40 to 50 dB. (or enable ``broadcast quality'' readback). .

[They also specify a solid-state Ga-A (J,-AS irradiation laser, with diameter A continuous beam of about 1 micron is applied to the recording surface. Meanwhile, the recording surface is exposed to the beam. keep moving against it. ] U.S. Pat. No. 4,222,071 discloses that the absorber is made of TO. It is emphasized that the material must be a “low melting point metal” such as Should be deposited as a ``film'' and not ``microscopically agglomerated'': In other words, it clearly has the following "pa-island" or "island-like" form. ).

Preparation of absorber layer 5 (Fig. 1): The absorber layer 5 preferably consists of a relatively thin layer of tellurium 83, which is free of space. (Thermal evaporated) and deposited. 1e is preferably a large batch coating The slag is evaporated in high vacuum using a vacuum chamber to ensure better uniformity. In order to achieve For example, a high melting point metal board is used for the source [1.2111 box-shaped board] The coating chamber used in the Δsh literature. all dust and dirt must be severely reduced using the most rigorous “clean room” techniques. stomach.

The substrate 2 is polished to the desired smoothness and deposited with a thin reflective layer 3. Subbing (priming) to a level suitable for acceptance 2- 8 (at least for the intended irradiation spectrum) 600 A is preferred, made of a flat aluminum plate. ) was found to be satisfactory. Aluminum is not a perfect reflector. If so, it can be replaced with ``multilayer dielectric'' or something like that. Engineers will recognize this.

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

Spacer 4 is a dielectric material, which 1. It is relatively transparent. Approximately 1583A of vapor-deposited Sin, (silicon dioxide) was used for this purpose (silicon dioxide). For example, it was found to be satisfactory in terms of writing/reading with λ-6328A. won. The tellurium absorber layer 5 is a high absorber for the intended recording laser spectrum. (e.g., typically 25% absorptive; 30% reflective; approx. Transmission of 45% of beam energy: due to 3 layer cancellation it is reflected Don't be transparent. The thickness of the absorption layer 5 depends on the thickness of the spacer 4.

If the light transmitted is to be reduced, the nopena thickness can be increased. would be desirable (N Will).

Te absorber with low melting point and relatively short heat dissipation length (long and low conductivity) 5 is considered a good "high-sensitivity" material that helps conserve the emitted laser energy. Ru. When the read beam from the laser source 1- is focused on the layer 5 at the V''' position, A small portion of that energy is deflected, another small portion is absorbed, and a large Parts are transparent. The transmitted part is reflected by layer 3 and (mainly) absorbed into layer 5. will be collected. Therefore, both the incident energy and the reflected energy are absorbed by the film 5. is heated to minimize transmission loss (note: the precipitation of 5 forms a ``trilayer'').

Variations in absorber thickness or uniformity should be carefully eliminated. Why If so, this variation will reduce the writing energy absorbed into the absorber film and This is because sensitivity deteriorates.

result: For our purposes, "sensitivity" is sufficient reflectivity ( or similar successive characteristics) is understood as the writing energy EW required to change the .

The intensity and exposure time of the focused writing beam are determined to give the required readout quality, etc. absorber layer 5 sufficiently to produce a specified change in reflectivity (at (e.g., thereby reducing the temperature of the prior art) any suitable contrast I~ or S, /N as known to the Department of Technology in ratio is achieved). 40-50dB typical for a bandwidth of about 15MH2, See signal-to-noise ratio (beak-to-peak signal to RMS noise).

The recording time is 30 to 470 nanoseconds (He-Ne). Typically 40 nanoseconds at 10 mW or about 400 pJ). This can be read at low power. It is intended to produce a minimum adequate follow-up or approximately 40+dB S/N when outputting. e.g., its output can be jqed using the same or similar laser equipment. 1 50-500 pJ/cm2 (1) J=10-” watt-sec , also t, J Joule) Theal. At the first stage of the intended assembly, the laser is a bit with a diameter of about 1/2 to 1 micron (i.e. 5000 to 10000A) Assuming a write pulse of about 40 nanoseconds focused on the position [backwarm to cold II] 60 nanoseconds, which corresponds to a disk rotating at 1800rpII+. It also adapts to the galvo-mirror light collection characteristics associated with ].

The recording body 1 is recorded in this way. (Comparable situations in literature, etc.) ) The Te film is sufficiently melted by relatively low power laser pulses. The well-known "pavit" or "crater" (crat1~3) gives about 50% bit reflectance against % background) but very little Also accompanied by "noise".

It appears that such "bit-bits" actually form voids (e.g. , see the photo in the ASll literature. It is a 2-10mW, 100ns laser - A crater in a similar Te film recorded with a pulse. Where The filtration rate of 250A of le used in reflection mode, the absorption rate of 37% It is said that it was shown. ). However, such Te films are deposited as a continuous layer. Despite the fact that It is stated in that document that the rim is accompanied by a rim. And this rim is the front It is thought that there is a close relationship with the "noise" mentioned above.

Obviously, the minimum writing energy E, lv within the minimum heating time (for example, About 10 mW of laser power (within 40 nanoseconds) is required to form a proper “hole”. (For example, if high power is applied too slowly, the heat from the absorber will escape.) Therefore, the ``bit'' is not written.)

Such a "hole" or "bit" is indicated by the position of the hole at "v" in Figure 1. It is implied as a position. And at least some of the absorber material 5 is clear It softens and moves at that bit location, decreasing the thickness there and increasing the reflectivity. (At least it is prior art or what is taught; for example, the △sh literature and and cited U.S. Pat. No. 4,222,071@).

Such spots can be read out by means known in the art; For example, similar lasers can be used at lower powers (e.g. 3mW using the laser mentioned above). in). An increase in the reflected energy received (with a suitable photodetector) is sensed to produce an output signal representing the bits that have been detected. These bits are back Easily identified from the ground. Of course this reading] - Nergi is recorded as such. This is insufficient to erase or perturb the recorded bits. [Note; reading In the output, the Pavit depth'' causes a phase change for the light reflected on the surface of Te, This is done at a frequency f such that the maximum contrast is 1q. ] EUiUJL: I am using the oxidation method as stated in the literature (see e.g. the oxidation of ) I know that the storage stability of this recording is poor. Ta. For example, under a known temperature/humidity cycle, recorder 1 (protected on layer 5) (without membrane) increases its reflectivity by 50% in about 2-3 weeks, which is mainly due to oxidation. It is clear that (the ``hole'' should have a ``high'' relative reflectance) However, oxidation increases the ``background reflectance'' between holes and reduces the required 5 27N is lost. ). The Te film of Example 1 has such "aging" )′” can be characterized by a rapid increase in overall light transmission after You'll understand.

This is probably due to not only the general oxidation of the metal, but also the This is due to intense location-selective corrosion that begins at the 'defect location' (MIL). 5PEC#810-B).

This is based on the above-mentioned “record storage memory” requirements (normal computer operating/storage conditions). It is very unsuitable for children (see Table I) for about 10 years.

Example The following examples illustrate some of the “°cold” absorbers in the form of island films according to the present invention. It indicates some typical uses and benefits. Its advantages and characteristics are mentioned above. It will be better evaluated by comparing with "Example e".

Example ■; Absorber made of gold; Figure 2: It is said that a gold absorber film 15 is used in place of the tellurium film 5. Other than the characteristics, the operation of the above-mentioned "le 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, on which a reflective anti-reflection base 1-△R (first Like the AR shown in the figure, preferably a reflective layer 13 is provided, and a transparent spacer layer 14 is provided on 13. ) is placed on the substrate 1-AR (its spacer 14) An absorbent film 15 is placed over the top.

Here, according to its characteristics, the absorber 15 functions as an absorber film. Deposition (somewhat similar to the TB film in 'l-e example'; e.g. ``gold'' filaments consisting of ``island layers'' formed (by similar means in the process) It consists of Lum. Here, very deep care is taken to control the absorber thickness during deposition. the intended minimum “dark mirror” as described below. form the reflectance R (e.g. 10% is chosen here). is shown in Figure 11 (100,000 times Te micrograph) and will be shown later. In addition, the film 15 is formed discontinuously into islands for optimum results. It is that you are.

Otherwise, the underlying spacer layer 141 reflector layer 13. and subst Rate 12 is (at least functionally) the same as the "le example" and is therefore absorber as understood in the art (see e.g. cited references) It is believed that it functions as a ``trilayer'' with 15.

Therefore, the gold absorber film 15 is preferably applied on the surface of the SiO2 spanner 4. It is formed by depositing gold on. It is the well-known ``triple layer'' The surface reflectivity of 5 (while monitoring the effect) is set to a preselected value Rm (here 1 Care is taken to form an “island” structure until the reflectance drops to 0% (0% reflectance). . The reflectance RITl can be conveniently set to a value that accommodates the appropriate parameter writing and reading. is possible. Here, about 10% (due to proper focusing of this laser, etc.) ) was chosen arbitrarily. Somewhat surprisingly, (as in the Te example ) "Writing" with the laser beam described above gives the appropriate sequence as described above. change in reflectance sufficient to indicates the emissivity and yields an acceptable S/N in the range of 25 to 40 dB; in some cases 30 ~50% increase is sufficient). The technical speed of sound is ``virgin ( unused or first)” relative to the absorber film, any other ゛weir small reflectance ``You will recognize that the clay can be selected.

Preparation of absorber layer 15 (FIG. 2): The absorbent layer 15 is arranged on the spacer layer 14 (on a relatively smooth surface; for example, its ．． 52 recording surfaces) deposited (by thermal evaporation) onto Somewhat unexpectedly, 10 Gold is deposited on this ``triple layer coating'' up to a ``minimum reflectance'' of R111 of %. In this case, an “island” is formed and the intended 1 no. 3,38△, 10mW.

40 nanoseconds), the reflectance changes significantly (which is entirely undesirable and It was quite unexpected); it is quite sufficient for a suitable sequel ( For example, increasing from about 10% to about 25-55%; see detailed discussion of results below. (see).

The absorber film 15 is therefore preferably fabricated using currently preferred technology. vacuum deposited (e.g., "gold" in a large vacuum chamber) onto the surface layer 14. It is deposited at a vacuum level of about 10-6 to 10-7 Jorr, and it is resistance heated. (performed using a molybdenum boat at a deposition rate of approximately 5-10△/SeC) a Alternatively, the silica layer 14 may also be coated with the gold film 15 before being deposited on it as well. is vacuum deposited. All rib straights are optically thin film for this Cleaned according to good practice.

This precipitation (due to thermal evaporation) is caused by a predetermined maximum reflectance of the film 15. Proceed with the necessary “island” formation until a small reflectance level (Rm) is obtained. This is very important. Otherwise, the desired result will not be obtained.

As technology knows, this cannot be done empirically or without Surface reflection of the reference specimen while the absorber film 15 is deposited until `` 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 quality or refer to techniques with other known methods such as monitoring electrical properties during deposition Do it).

Blood 1: The results are consistent, especially in the light of the expected properties, and as described above in "Te Example". Te sucking made by vA! Very surprising compared to traditional media like 2 bodies. It is a kimono. That is, the recording body 101. J It was recorded on it, and it was published one after another, For example, if the sensitivity is measured and evaluated as in "T e example", , using a 1-(e-Ne laser system) of the type previously described. The bit position where the absorber is placed is like an “agglomeration hole” where the absorber is “agglomerated”. ” and the absorber material is moved around or beyond the hole. ). The diameter of the hole is 1q compared to the diameter of the reading beam (e.g. 174-3/4), showing a similar increase in reflectance and higher output signal.

Figure 6 shows the ``agglomeration hole'' < or ``pseudo This is an artistic expression that shows the ``Agglomeration Hole'' 15P. As a roughly circular loaded spot, Ma/ζ absorbs unwritten virgin material. It will be understood as a physical-optical discontinuity in the body film 15v. spot 15p is on the order of the laser beam diameter (e.g. 40-120% of it) , containing a ``rim'' or partial rim around its periphery.The inside of the rim is usually relatively Less absorber material is present; what is present is agglomerated into absorber globules gc many of which are relatively large (e.g., many The item is larger than the virgin film 15v or the small ``island'' in Figure 11. (usually only a few exist over relatively large distances). In short, spot 15p is an "optical hoid" or discontinuity for the selected readout wavelength (λW). I love sex! lJ or, on the other hand, Virgin Island Film 15v is relatively continuous It will be understood as a (partial) reflector.

Therefore, the technical speed of sound is such that such "agglomeration hole" 15P is known for tellurium. Recognize that it is functionally equivalent to traditional bits such as (see examples and references).

As detailed later, such "island" absorber films form excellent recording media. It shows what can be achieved; remarkable archival stability, unexpectedly high sensitivity, and and high S/N, while surprisingly low write energy and significantly lower write Requires only temperature and clearly supports overcoating It has a sexual nature. [, where useful overcoating limits the range of actual usefulness to The operating performance will not be deteriorated by exceeding the limit. Currently, the lower e-absorber is deteriorating and is likely to The reason for this is that it clearly requires relative movement of the absorber material. Probably. In contrast, the present invention provides almost all of its absorber from the bit position. bits to pass through the read beam without having to move everything that way. The technological speed of sound lies in the fact that holes can be recorded or drilled. You will be pleasantly surprised to find out. The present invention is achieved by simply "agglomerating" It can be carried out by There is little or no need to move material outside of that bit location; There is no need to remove it outside the area. ] Details are given below.

Island shape of absorber film: FIG. 11 shows the first virgin of the gold absorber film as described above. Microscopic plan view of the reflective surface (not recorded above) (Transmission electron microscope at 100,000x magnification) photo). This surface is a physically discontinuous or partially discontinuous “island” structure. It looks like a fairly uniform pattern (semi-island on SiO2 spacer) It is clear that it shows. Regarding this example ■, the number of islands is several hundred. It can be seen that they have a diameter and are separated by intervals of similar dimensions. Wax (for example, 5000-100% film 15 consists of '''%% void''' (e.g., a few percent to 10% void).

Now, if we expose a portion of this virgin film to a laser recording beam as described above, , these ``islands'' will be ``agglomerated'' and the ``percent void'' at that location will be reduced. Increase the deforestation (larger island spacing) and add some island material. If the ejecta ejected from that position to the surrounding area or beyond the surrounding area (see e), forms a small (not necessarily continuous) ``rim'' there. A "collection hole" as shown in Figure 6 is formed.Here, this process is called "agglomeration". It is characterized as

This pie island “structure” was unexpected. What is even more surprising is that The fact that the “recording properties” have been realized is completely different from those shown by the “bulk gold” properties. The results showed a positive effect.

As mentioned above, creating an ``island'' structure in the ODD absorber film is , is not stated in the literature; not only that, but the literature contradicts good implementation of this I. (e.g., as disclosed in U.S. Pat. No. 4,222,071) (see discussion above).

At least some of the primary factors controlling such island formation are: Absorber material, deposition rate, adhesion; substrate material and shape (e.g. cleanliness) , roughness, etc.) and temperature: presence of “nucleation layer”, presence of vapor contaminants (degree of vacuum) , and such factors, and they are to be recognized by the technical speed of sound. Dew. For example, a substrate that is too cold may form a continuous film. , but at too high a temperature it will not form a film 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 fibre, except for the silica substrate covered with a mass layer (as in Example I) A rum is formed. Figure 13 is similar, with a chromium nucleation layer instead. It is used. Compared to Figure 11, Figure 12 shows thin islands with wider spacing. (There are no islands).

The laser device quoted (at the power level quoted) is fully exposed on the film in Figure 13. On the other hand, the film in Figure 12 had a slightly lower impression. It was possible to write in the same way as in Figure 11 (Example ■) except for degrees.

The technical speed of sound depends on such "island" patterns (factors such as readout/printing conditions). (e.g. writing energy, beam width, /l, etc.) You will realize that you can give Thus, in example ■, about 40 A satisfactory bit hole with a diameter of 0 to 10,000 can be (gives a satisfactory S/N, etc.).

It is recommended that an island diameter that is too large or too small is unsatisfactory. It will be measured. More specifically, the dimensions and spacing of virgin islands are When recording, it must be suitable for agglomeration as described above, and the average island diameter is much smaller than what is becoming a continuum film, i.e. 2. Percentage void that thermally isolates individual islands): Furthermore, the area The dimensions of the field are (relatively continuous) for the selected λ(R,/W laser) Large enough so that the absorber film 15 can be ``visible'' like an ``optical reflector.'' % void must be sufficiently small). If the spacing is sufficient, the spot When laser heated (written on), the film 15 has an “optical switch” The above-mentioned "agglomeration hole" is formed so as to produce a "ch", and the detected reflectance is It will be ``agglomerated'' showing a subtle change.The remarkable change in reflectance is expected. Corresponding to the S/N, etc., the ``spot'' becomes ``relatively transparent''. , and like a traditional ``bit'', the ``bit'' relative to the associated optical system. Opening'' (transparent).

In addition to the above, the writing beam now acts on the islands within the bit locations to 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 The resulting power is so great that it exceeds the zero value (referred to as a ``turf mirror''). It is estimated that

Of course, if a triple layer is formed on the optical lower substrate, the absorber ・The spacer/reflector actually increases the reflective power (for example, here about 10 % to about 30%).

Typically, this write operation essentially removes a significant amount of absorber material at the bit location. In addition, it provides energy to the absorber film. In this way, it is written If the spot shows 25% absorption, 45% transmission, and 30% reflection, then The ``spot'' has these values about 30%, 10%, and 10%, respectively, with respect to its writing wavelength. It will change to 60%.

This write beam increases the percent void (area), so the write beam Obviously it gives energy to the islands of that writing spot and the increase their average dimensions and also increase their average spacing (i.e., their ``agglomeration'' into a smaller number of islands; ``metallic films'' have received some attention as a general proposition in the literature. For example, the article with the same title by □ oremus, J.

Ap+1. Physics: June 1966, Vol, 37. #7゜P2 See below 775. There the gold film is mentioned and tailed. ;　Truong Qptical QOnStanlS of△ggregated gold F ilm”, Journal of Qptica13ocie ty Am, Vol, 66, #2. February 1976, P12 See also 4 below. There, a gold film was heated to 300 degrees Celsius on a glass substrate. The particles are formed by vapor deposition on the surface of the particles, and their remarkable sonic speed is determined by the fact that the particles themselves have bulk optical constants. We believe that it is reasonable to assume that the ;AnderssOn and N, orman's 3 trucilal and E 1ectri cal P properties of D 1 continuous G oldl"11m5 on Glass", Vacuum, VO+, 27. #4. 1977, pergamon press, Qreat [See also 3ritain.

It examines the electrical resistance of such a film and determines whether this resistance is the same as that of bulk gold. This shows that it is greater than the resistance. ).

However, such “island film” of either gold or pond metal That there are some advantages to using it as an ODD laser recording medium. No one seems to have discovered it. In fact, the technical speed of sound is determined by a "continuous" absorber filter. It seems that it was intended only for (For example, cited U.S. Pat. No. 4,222 , No. 071, child. That is, the absorber must not be ``agglomerated'' and must be a ``continuous fibre''. or IBM-TDB, Ma See rch 197L P4O10. It is a continuous gold + amorphous sublayer. It shows a metal layer like that, and its amorphous state is similar to silicon. . These layers are a mixture of gold, crystalline silicon, and amorphous silicon'' 111 is heated to form. ).

Such a layer is formed on the triple layered structure forming such an “island-like” absorber film. It was entirely by chance that I formed the ``minimum reflectance'' precipitate. Without such an O It would not have been possible to provide a DD 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. The soil spreads and reagglomerates. 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 one drawn) will be a dragon.

And engineers believe that such "island" absorber films (such as those mentioned above) Couldn't be sure how it would work on >00 disks.

The technology is sonic that such island films can be laser written, Recognizing how amazing it is to form such a ``Tokyo Hole'' Yes, it is. Rather, one spreads the softened material at the writing position in such a way that One might expect that continuity of the absorber film would be necessary for For example, if the bit position is expanded as assumed in the cited Z ech document, Geru: ``Surface tension'' causes ``plane cooling'').

It is superior to the record storage stability of the tellurium recording medium in the ``Te example''. (and better than any previously known tellurium recorder) . For example, <periodic temperature rise/high i! i1 under the nail environment) light in the ``aging'' test Monitoring of changes in optical reflectance shows that this HeU film is superior to that of similar tellurium. It will be found to be significantly more stable than film. Technology sound speed is gold film It is well recognized that such It is highly unlikely that a gold absorber composed of It was a great surprise. In other words, in this case, the information is 5-15 mW/10-100 nanometers. (or 100 to 1000p, J,) output, which is sufficient to print on the gold triple layer. This is truly surprising; it defies theoretical predictions. The level of sensitivity shown is actually quite high (as compared to the level of sensitivity reported) and is very different from what the literature teaches. Ru.

i.e. compared to well-known and accepted "good absorbers" such as Te. Therefore, gold has a relatively high (bulk) melting point (about 106°C compared to about 4.50°C for Te). 3℃), and has excellent thermal conductivity (that of Te is very poor, while that of dimetallic metals is the highest). have). One might therefore conclude that the gold absorber is actually not sensitive at all and that One would expect that the sensitivity would be far inferior to that of the standard.

Zunari literature praises tellurium as having far superior sensitivity than titanium. Titanium has a high melting point like gold but poor thermal conductivity like Te. has.

So why is gold comparable as an absorber? (For example, Te yes It has the lowest thermal conductivity than the other metals, while the current thermal conductivity is about 100% that of Te. Only CU and 80 do not exhibit higher thermal conductivity than gold.

One reason (see below) is that different writing mechanisms (“forming to” or “writing”) ) may be related.

A related reason is the “island” form of the gold film as mentioned above. Not possible. In order to change the reflectivity of the film, it is necessary to energy, or much lower write energy than the nature of “bulk gold” would suggest. Obviously you need it.

Low temperature record: The big surprise is that the ``reflectance change'' shown is at such low (write) output levels. and clearly occurs at such low temperatures (this symptom appears at about 300°C). occurs, which is considerably lower than gold's published melting point of 1063°C, which is By example, islands of are deposited on a polymer and recorded on it. It's confirmed. The melting point of Naginara's polymer is much lower than this 1063℃. It is from. (See example below). As an absorber, it can be used as a High melting point material i.e. has excellent storage properties and therefore for a long or lifetime Materials that reduce risks such as corrosion and performance deterioration) will draw attention to technology Maybe.

Of course, the island structure of the film explains this apparently reduced melting point. I'm not sure if I can use a writing mechanism other than "Yopa-ryu W?" Maybe, but no one is sure yet. One theory is that Nire is such an island. has a high internal energy, so a relatively low writing beam energy can without causing their “splitting” and thus eliminating the need to “melt them”. It can be made into a collection IfA without any need.

In any case, the speed of sound technology clearly welcomes the availability of such novel "gold absorbers". There will be. Because of the well-known manufacturing, precipitation, and handling In addition to the ease of storage, excellent storage stability and computer disk recording Not only due to its suitability for use as ``Modulation'' is often referred to as ``modulation'' because it offers special and unique advantages in writing. (e.g., there is no need to heat the absorber bit location to conventional melting point temperatures). Also , the reduction in write energy and recording temperature will also be appreciated; these are 3 Possibility of “laser writing” with significantly less energy and writing to smaller bit areas Promises the possibility of writing. For this reason, a spanner (and some cladding) ) is a good thermal insulator with a relatively low heat capacity as discussed below. It is thought that.

Dissolution of the absorber film, as in the case of the Tee absorber in the ``Te example'' above. (for example, absorbent material) without the need for intense heat or macroscopic changes typical of A system in which bits (without requiring such large transfers of material) are recorded. will be welcomed by the speed of technology.

Overcoating; Effect“ In the "Example", 5 inches (100 mm) was applied on the Te absorber film. It was like a coat, but a true functional overcoat of the kind that TechSonic wants. (e.g., blurring dirt and dust from surfaces; preventing the ingress of vapors such as water and oxygen) Also, it is used to retain the heat of writing, so it does not cause scratches. does not provide a clear polymer (a few thousandths of an inch) that can be handled and recorded. Ta. This S10 coat did not affect the "bit formation", but required writing You probably want to increase the energy by about 2 times if it pushes the Te film at the bit position. This is probably because it is attached and obstructs the movement of the Te shrine there. ).

Engineers have discovered that patterns such as bits in Te and bubbles in other metals It is expected that the "processing record" will be obstructed by any "overcoat". For example, if you want to remove the absorber from the pit position, and prevent any ``ejector'').

However, when a gold film like Example I is similarly overcoated, such There were few or no disturbances, and the sensitivity was only slightly degraded. child This is evidence that different types of bit forming mechanisms are at work.

This reinforces the idea that the instantaneous recording mechanism is entirely novel, and this Engineers would agree that the processing and movement of island materials is 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. If it is Nagi, there is a problem with overcoating. This is because not being affected is extremely important.

Mourning of the characteristics of “Bulk Au”: Another feature based on the above example ■ and others is that such (gold) paai Is the land film “absorber” compatible with its reported “bulk” (gold) properties? It can be seen that heat does not spread as expected (for example, heat directional conduction does not seem to be important). The development of such “island film characteristics” The view is important and will be discussed further below.

These ``agglomeration holes'' (reflective switches) It appears to be formed at a fairly low temperature, which is almost identical to the expulsion of the absorber. Or it doesn't matter at all, and furthermore, the write requires much less write energy. It looks ugly.

Typically, such island-like absorber films can be utilized to form OD disks. (e.g., all or most of the requirements in Table I) Instead of pure gold that satisfies the This is the same as the example except for the following. This is a laminate (lamina) for vapor deposition reasons. applied as te): @ first gold, second then tin, then gold (or two of tin and gold) (Additional layers may be added.) By heating, this “laminate 1~” becomes ALI/Sn. They will interdiffuse to form an alloy (mostly gold and therefore °' properties of gold will prevail).

This Au/Sn film is placed with the island film of example (15 in Figure 2). and written on it as well. The effect was qualitatively similar to Example 1. However, it showed excellent storage stability and somewhat poor sensitivity.

Adhesion of AU: It was also observed that the gold islands were only weakly attached to the silica. (e.g., can be easily wiped off). Also transparent for better thermal insulation When replaced with a polymer spacer, almost all the gold (no adhesion) The number is O).

Therefore, a thin tin “strike” (island form) A pre-deposition of This should be formed on top of the glass, followed by the deposition of 80 islands).

Polymer spacers were used later. As example ■ shows, the results are particularly - The adhesion of gold to the substrate was greatly improved; (maybe the island structure did not change).

Example m: sn fludge], (flasll), /AU on polymer (Fig. ): A clear polymer (e.g. DEFRON) is used as a spacer to connect the tin flash. (“strike”, as an adhesion promoter) is inserted under the solid gold absorbent body. FIG. 5 shows that everything else is similar to Example I (FIG. 2). Therefore before As in, we have disk 212, subbing@212-3 on that disk, Next, reflector 213. Spacer 2 (of clear Teflon or similar polymer) 14° and absorber 15 (island-shaped pure △u; Shigashi island 3n 2-8R (deposited on top of the layer ST). On top of this Written as before.

Gloss 1: Same as Example ■, but gold has thicker (improved) troughability, sensitivity, continuation, and preservability. Ta. Zunawara, the gold (island) is the substrate (transparent polymer). ・It adhered firmly to the 3n island on the spacer. Sensitivity and successive changes have greatly improved. Therefore, this 3n strike film has improved adhesion (to polymers). It is thought that it not only works to improve the optical success rate, but also to increase the optical success rate, which is no small surprise. This is something that should be done.

One such surprising optical effect is shown in Figure 7, and it This is the fouling index (and refractive index) of the virgin island film. Example■ A pure gold island absorber, such as It shows reflectance/λ characteristics like line B. This is clearly a He-Ne laser spec. (6338 people) indicates that it does not work well above or below the For example, the necessary formatting of an OD disk cannot be performed by a 44 degree person. , it is also not viable to use a Qa-ΔS laser instead). Completely surprised If a Sn (island) strike is applied to this, as shown by curve C, It acts to "flatten" the reflection curve of the absorber.

Technicians will recognize how important such increased beam width is. .

Example I (t’1ljAu on SI O2) has slightly insufficient record keeping properties. For example, it is insufficient in its resistance to water vapor ingress; this is probably very weak. How many people wear it). On the other hand, this A, u/Sn island structure is extremely superior. Ru.

Of course, polymers are highly susceptible to thermal degradation and therefore (Sn, followed by Δ(for J) The deposition step is kept below its temperature limit (~100’C) Ru. Such gold films (which can withstand "archival" conditions such as those described here) I'm sure you'll get it. Such ``golden records'' are Under the conditions of ■Example designed to be reproduced. However, as a protective overcoat, A transparent polymer supercoat is applied onto the acquisition layer 15.

■: Same as Example ■ except that the sensitivity deteriorates slightly, so it is passed the test. O Tolerance to carbon fiber coatings is a remarkable property: in technology This is highly desirable.

It was said that the date and time of the gold was: (a similar small amount of %) tin. except that it is deposited simultaneously with gold (rather than as a preliminary “strike”). [This is the same as example ■.

Result: Exactly the same as Example ■.

Example ■; Same as Example ■, but Si02 appears in Poly22H: A thin layer of 5i02 is deposited on the polymeric spacer 214 (Figure 5). Except for this, it is the same as Example ■, and a 3n strike is deposited on the 3i 02, and then Gold is deposited.

Li2 Example Same as ■, but the sensitivity was significantly reduced.

While such polymeric spacers are viable, silica is discouraged (silica (widely reported as favorable) may come as a surprise to technical habits. Dew.

Example ■; to u/3b: Tin (strike on polymer and above 5 toz) is replaced with antimony. This is the same as Example ■ except for.

Wang: Although the sensitivity is better than the previous example, the recording stability is very poor, which is surprising. As expected, the small sphere ejected (see e in Figure 4; in this case, compared to the example of light, the ejected In-hole agglomerations and ring agglomerates (see Figure 4: elements i, r).

Figure 4 shows a typical “agglomerate hole” written on such an ALI/Sb absorber. The “virgin” island array is shown here as an idealization. not present.

The latter property (easiness to create links and local agglomerations rather than ``synthesizers'') is impressive. It demonstrates the possibility of controlling the development of agglomerate movement. , overcoating (which is expected to further stop all ejecta) This implies a ball-forming mechanism that is minimally influenced by

Co-deposition of such Au,/Sb alloys (at the same concentration) would show similar results. Dew.

Example ■; AU, /3b /Sn: Following the Sn strike, an antimony strike is applied, and then the gold is heated to the mold temperature. Same as example (3n strike is applied on the polymer) except that It is.

Tae 2 Song -: Almost the same as Example ■, but the sensitivity is slightly inferior and the record keeping is poor. It is slightly better, and there is also a tendency for there to be fewer “ejecta” in general (as shown in Figure 4). , slightly more than example ■). Simultaneous deposition of Au-3n-3b gave similar results. will occur.

Nine l22 (: Palladium replaces gold and the substrate is a transparent polymeric spacer. This is similar to Example I, except that it is a server.

O: Almost the same as Example ■, but like Examples ■ and ■, there is generally less ejecta ( There seems to be a little more ``rim conglomerate'').

Same as Example ■ except that Pd is used instead of gold (Pd is (deposited on the Sn strike).

O: It is the same as the usual doctor except for the record keeping ability. Or it is similar to example ■ ( For example, increased bandwidth.

Resistance to natural gas intrusion, related dislocations of virgin hex islands, etc. ).

f! 1tXf:Au/Pb-1:Nate: except that tin is replaced with lead This is the same as Example ■, and the absorber film 15 (Fig. 2) is a series of gold, lead, gold, lead, and gold. It consists of island layers, each layer having a suitable island structure. heated When these island layers easily interdiffuse (the distance is very short), A Form U/pli alloy islands. Since ALI is the main component, As a first approximation, the nature of pb can be ignored. Therefore, the alloy is mainly made of gold. It will show "sexuality".

Film 15 was deposited as a ``laminate'' for testing purposes; Other methods of sex are also possible.

[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 R is optimized, , the technology is sputtering or high vacuum in a known and reliable way. evaporated by ``co-evaporation'', a method that allows the realization of more homogeneous alloys. would prefer to wear it. Such umina films are somewhat non-uniform. and therefore may not be ``optimal'' for most applications. . However, compared to e.g. a co-evaporator, it proceeds based on a first approximation. Very fast and cheap to go.

and can be carried out conveniently. ] Symptom 1: As mentioned above, or as shown in Figure 11) In most cases, it is possible to avoid precipitation 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 Figure 8 with a pair of spaced live electrodes. ing. This “pseudo-island” (“island-like” or “peninsula-like”) form is It appears to be ``aggregated'' in the manner described above, and in the manner described above in Example I etc. , forming ``globules'' that are more discrete ``pseudo bits''). therefore It is thought that they are functionally similar. However, these filamentary semi- Islands exhibit even lower lateral electrical resistance than "islands" such as Example I. However, the resistance is quite high). Furthermore, they write “agglomeration holes”. They function similarly to the aforementioned ``island'' equivalents of ``thermal insulation''. It is thought that it maintains its "sexuality".Similar to "island", such filament Mento-like structures can also be characterized as "island-like". It is another “island” Similar to film, "agglomeration holes" are formed and recorded.

In this case, the sensitivity is the highest and is better than in the case of pure gold (Example ■). for example It has approximately the same ``sensitivity'' as tellurium absorbers, and is often superior to it. For example, about half the sensitivity of the "Te example" has been measured). Sunawa In this case, 5~15111W/10~100 nanoseconds (or 100~1000 In the output range of p, J,), information is sufficiently “written” into the gold/lead triple layer. Can be done. More specifically, approximately 40 nanoseconds is a short period of 5 mW output. ``Changes in reactivity'' can be seen, with some samples exhibiting changes of about 10 to 15 nanoseconds. The output power of 1-2 mW between the The change is shown in a short period of time. In either case sufficient readout (e.g. 30-40d S/N of B> is shown. This is truly surprising, as the sensitivity level predicted by theory It is many times higher than Bell, and is completely inconsistent with what would be expected from the literature. deer However, its archival properties are very low, and for most purposes, pure Au and △u-8b).

Also, relatively small "ejecta" are observed as in the case of AU/Sb.

1 present: Some results of examples ■~X■ are shown in the following table ■ in a relatively crude manner. compared to. Now, assuming similar construction and operating/test conditions, we will - Add evacuee ink. [Note: S’y is sensitivity, A’V is preservability. ``rim'' or ``ejecta'' indicates the possibility of rim or ejecta formation (e.g., high, low); “i””.

``2°'' means ``best'', ``second best'', etc.; ×× means ``second best'', etc. Does not indicate 'unavailable'.] S'y: 4° 5° 1° 2° 3° 40 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 an absorber film, the absorber material is By applying it to the land shape, surprisingly good sensitivity can be obtained. . Furthermore, for example, in order to ensure good sensitivity and extend the archival lifespan, Negative metals such as gold and palladium or their alloys can be deposited as absorbers. Things can be taught.

Additionally, island film absorbers such as gold can be used to increase sensitivity (and It can be combined with ingredients such as lead or antimony (e.g. in small amounts (%)), and materials such as tin for improved archival properties and optical properties (e.g. increased bandwidth). It is also possible to combine it with minutes.

In addition, by combining gold or palladium with other ingredients, holes can be Formation agglomeration (geometry can be controlled to some degree (e.g. rim grains predominate, in other cases ejecta predominate, Au+pb or P(++s Minimize the possibility of n　k;j　“ejecta”′ and Au +3n +3b , ΔLy, increases the bandpass and reduces the ejecta. ).

Also, combining gold with lead, tin, or antimony Improves adhesion (to the absorber and spacer) and prevents moisture from entering at the interface between the absorber and the spacer. It seems to increase archival stability.

The technical speed of sound is higher than that of electron beam recording or fR recording for such absorber films. You may notice other recording methods such as

Figure 9: Figure 9 This schematically illustrates another application of ``radio agglomerated'' island films. Here, the airlan j...film (ab, ) is inserted from an appropriate position inside the frame member r. deposited on the blastrate (for example, a transparent polymer as in the example above) AU or A1 alloy on glass with an overcoat of Radiant energy source LS (For example, the irradiation beam b1 is applied quickly (or periodically) onto the mu ab.

Initially, film ab reflects most of beam b (e.g., the reflected beam reflected to the first detection device D1 as a beam b). However, film ab (on top The part that the beam hits) is heated by the LS to a predetermined level. For example, by a nearby fire or flame, up to the agglomeration temperature), it It agglomerates and becomes ``transparent'' (with respect to λ1 of b). ab appears relatively transparent to λ1). Thus ab passes beam b1, This results in a transmitted beam D2 suitable for detection by the associated second detection device D2.

Source LS may be stationary, typically directed towards device D2, and its initial Holes are formed in the film ab by the irradiation energy (beam h,).

or alternatively, beam b1 is scanned across film ab and the beam b1 is You can also ``write'' the turns. Also, in the case of immovable BL, the etched ``mask'' It may also be a source of “overall illumination” or “backward illumination” (e.g., (to make a play or optical printing plate). The engineers are Other similar applications may also come to mind.

Example of change: Engineers believe that such ``island'' (or ``island'') films may other metals or their alloys (e.g. All or other binary alloys of PD). or other metals such as Pt, Cu, Ag, R'h) can do. In many instances, the absorber film is antireflective or Conveniently bonded to similar optical substrate structures.

In other examples, such island films may be The technique (evaporation) is very practical, as in Example 1, it can be used to (can also be used to deposit the associated layer of).゛′ For alloys, 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 deposited island structure during the precipitation. It is advisable to monitor the film.

Circle 1: 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 pre-switched when properly illuminated. Applicable to films.

The above examples of possible variations of the invention are merely illustrative. Therefore, the present invention is attached including all possible modifications and changes within the scope of the invention as set forth in the claims appended hereto. should be considered.

Engraving (no changes to the content) FIG, 3゜ FIG, 4° FIG, 7° Procedure amendment writing method) January 25, 1980 Commissioner of the Patent Office 1.Display of the incident International application number: PCT/1Js831008042, title of the invention Island suitable for digital data storage using low power writing lasers C-shaped thermally insulating recording film 3. First, make corrections. Relationship to the incident: Patent applicant Address: Detroit Burroughs Bure, Michigan, 48232, United States Chair (no damage) Name: Burroughs Corporation Representative: Williams, Walter Jiei 4, agent Address: 2-3-9 Tenjinbashi, Kita-ku, Osaka, Yachiyo Daiichi Building, voluntary correction 6. Subject of correction 7. Contents of correction that's all

Claims (1)

[Claims] 1. In an optical data recording system, a combination comprising: A thermally insulating optical recording medium. A means for providing recording radiation of a prescribed wavelength. Means for adjusting said irradiation to provide a prescribed minimum write 1 energy level according to the data provided. Means for focusing a regulated illumination of the prescribed beam onto the recording medium. a means for imparting relative movement between the focused recording beam and the recording medium; Step. The recording medium is used for reading with a similar radiation beam, but at a reduced power level. The medium is a polymer length straightening means; at least one layer of ultra-thin, discontinuous absorbent material deposited in the form of islands; said discontinuous layer is "agglomerated" by applying said beam at said writing energy level to a prescribed bit location of said recording medium; thus changing its optical properties during said movement and being detected by the associated follow-up means. It will be done. The island film has an average width that is significantly smaller than the width of the beam. 2. A read illumination beam with a predetermined wavelength and width corresponding to said recording beam. Invention 6 as set forth in claim 1, comprising means for providing a light beam. steps and said means for imparting relative motion, each of which has a successive bead on said medium. It is used to focus the beam and to give the relative movement. light of said medium The change in optical properties is such that during the relative movement between the focused reading beam and the medium the light reflected from the medium changes according to the so-called data. The choice is made in relation to the energy level and wavelength of the reading beam. Further, the reading energy level of the reading beam is indicative of the data indicating optical changes. selected so as not to have a significant impact on the subsequent succession of the data. The absorber material contains negative metals. 3. In optical data recording systems, a combination comprising: 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 discontinuous layer of absorber material deposited in the form of an island onto a polymeric substrate means, the discontinuous layer being located at the prescribed peak of the medium. "agglomeration" by applying said reading beam at said writing energy level to said "agglomerated" beam, and thus by an associated reading means during said movement. detectably changes its optical properties to receive the prescribed detection. The layer exhibits one or more layers of well-defined islands of absorber material, the islands having an average width significantly smaller than the width of the beam. 4. Data conditioning for recording exposure. a focused writing beam onto the medium and at the same time relative motion therebetween to create a prescription for writing data bits. An optical medium for use in an optical data storage system, wherein the beam may be data conditioned to provide pulses of written energy. The medium comprises at least one layer of thermally insulating absorbent material deposited in the form of discrete islands on the polymeric substrate 1 to means, said layer being is 'agglomerated' at its prescribed bit position by applying a recording beam pulse and can be read out during said movement by prescribed associated optical sensing means. In order to make this possible, we are changing it so that it can be optically detected. The island layer is formed to exhibit a distinct island shape of absorber material having an average width significantly less than the width of the beam. 5. Any claim described in any one of claims 1 to 4 that includes the following: invention. The radiation is from a laser source. The medium is comprised of a plurality of layers including a reflective layer, a polymeric spacer layer overlying the reflective layer, and an island-shaped absorber overlying the spacer layer. The thickness and optical properties of the layer and the optically detectable changes in the absorber layer are related to the reading laser energy. selected in conjunction with the optical level and wavelength, so that during the relative movement between the focused read laser beam and the medium, the read laser It therefore reflects the reading beam from the changing medium. Furthermore, the intensity of the reading beam is selected such that it does not significantly change subsequent reading characteristics of the altered optical properties. The polymer spacer is a relatively good thermal insulator when recording and is relatively transparent to the radiation. 6. The absorber island layer is deposited by evaporation from a melt in vacuum. The invention according to claim 5, characterized in that: 7. The total thickness of the absorber island layer is several hundred angstroms or less. 7. The invention according to claim 6, characterized in that the order of magnitude is less than or equal to . 8. The polymeric spacer layer is formed by polytetrafluoroe9, the medium comprising an antireflection base comprising the polymer with very low thermal conductivity, on which the island layer is deposited; Seisen ranges 1 to 10 characterized in that the medium is selected accordingly, and the island layer is treated. 10. The invention according to claim 9, characterized in that the deposition is performed until it exhibits an initial minimum reflectance value. 11. The island layer is formed by vapor deposition while its reflectance is monitored. The invention according to claim 10, characterized in that: 12. Before recording, the write energy incident on the bit position is retained during recording. The polymer substrate was selected and used to deposit the island layer, thereby allowing low power/low temperature recording without the need for the absorber material to be heated to its bulk melting temperature. Claim 1, which is characterized in that The invention described in any of Items (4) to (4) above. 13. The average size and average spacing of said islands have changed over the course of such recording. Claim 1, characterized in that the material is selected and used in such a way that it is formed so as to enable "agglomeration" such as "agglomeration" to cause a significant change in reflectance at each recorded bit position. The invention described in any one of Items 1 to 4. 14. The island layer causes such a change during recording, and furthermore, the recording history It is characterized in that it does not require the removal of almost any absorbent material from the 15. The island layer is covered with a protective defocusing overcoat, and further comprises a portion of an antireflection base. Precipitated on a translucent polymer that acts as a The invention as set forth in any one of claims 1 to 4, which relates to sexual punishment. , 16. Light used in optical recording systems over long-term archiving periods A method for manufacturing a medium as an academic data recording medium. The system includes a data-conditioned laser writing beam of a predetermined wavelength and prescribed writing energy; A beam is focused onto the medium while relative motion is imparted between the beam and the medium. The method includes the following steps. Provides a reflective support means having an irradiated translucent dielectric spacer layer formulated thereon. step to serve. depositing one or more absorber layers in the form of islands on the spacer layer; step. The thickness and optical properties of the layer are such that the anti-reflection state at the writing wavelength is recorded on the medium. selected to be dominant in the unrecorded areas. In general, the thickness and optical properties of the layers are selected as follows. The writing beam The data adjustment provides prescribed write pulses of the write energy to selected bit locations of the absorber layer. Irradiation to each such location is performed using anti-reflection coatings at that location. detectably alters its optical properties to enable the prescribed optical delivery. The thickness and material of the polymer layer are selected and configured to maximize thermal preservation at the irradiated island site i6 and optimize sensitivity. It will be done. 17. The invention of claim 16, wherein the absorber layer is deposited until a prescribed low reflectance level is first detected. 18. Method for preparing recording blanks for improved exposure recording. Therein, the information layer is disposed on the bus 1 and is used to record digital data bits by providing a writing beam of optical energy with a prescribed writing energy and wavelength. . The method includes the following steps. Depositing a prescribed relatively small thickness of ``absorber material'' onto said substray 1 to means, thereby exhibiting an array of isolated ``islands'' and having a prescribed initial reflectance. Forms a continuous recording film. The above fee The beam appears ``optically continuous'' with respect to the writing beam. It is possible to apply a writing beam such as The data can be adjusted to provide prescribed write pulses of the write energy to selected locations. This causes a prescribed ``agglomeration'' of the absorber islands, rendering the film optically discontinuous and perforating it with an optical hole, thereby allowing the detection of each written position representing the data. changes the reflectance. The absorber material is selected and deposited in conjunction with the surrounding optical/thermal environment to cause "agglomeration". 19. said substrate means comprises an optical anti-reflection substrate, and said absorber material is deposited until it exhibits a prescribed low level of first foul rate; 19. The method according to claim 18, characterized in that: 20. Claim 19, characterized in that the absorber material comprises a main portion of a formulated "absorber metal" which is deposited until it exhibits an initial initial reflectance. How to put it on. 21. The method of claim 19, wherein the metal is used in combination with at least one other metal to improve adhesion. 22. It uses a low-power archival radiation source and has a relatively long archival lifespan. method of providing recording blanks for use in The radiation source provides a writing beam of a given wavelength and relatively low writing energy. The method includes: The substrate has a recording portion exhibiting prescribed optical and thermal properties at a given wavelength. Application of a formulated information coating onto said portion of said substrate. The material for this coating comprises and comprises at least one ``absorber metal'' selected to exhibit a prescribed absorption power and ``initial reflectance'' at a given wavelength, and an IR of said writing energy. After receiving the pulse pulse, the prescribed “successive reflectance” is changed. be made to become This corresponds to the information to be recorded at the prescribed ``bit positions'' on the coating. One or more layers of ultra-thin discontinuous island formed of spaced apart island 1- It is precipitated as a code diagram. Also, by application of the write energy pulse, it is "agglomerated" and produces a change in reflectance with respect to the read anti-QJ ratio level. , which results in better detection compared to unrecorded areas that exhibit early reflectance. Provides readout contrast that is consistent with At least one of the layers includes a noble metal. 23. The substrate is anti-reflective and the information coating is The metal is deposited to a depth sufficient to produce an initial reflectance of ``initial minimum anti-gFI'' and agglomerates to form relatively few and widely spaced ``islands.'' 23. The method of claim 22, wherein the substrate comprises a spacer and an underlying reflector surface; 24. The method according to claim 23, wherein a "triple layer" is formed by stacking a further metal island layer. 25, characterized in that the polymer consists of poly1 to terafluoroethylene; Claims 1, 3, and 4. An organization listed in any of Sections 5, 16, 181st, or 22. Akira. 26. The absorber includes at least one kind of coexisting component metal in addition to the noble metal, and at least one kind of the coexisting component metal is added to the polymer prior to precipitation of the noble metal. 26. The invention as claimed in claim 25, characterized in that the noble metal is independently deposited in islands onto the substrate, thereby improving the adhesion of the noble metal onto the polymer substrate. 27. Such multi-a layer island layers are deposited with an initial island deposit layer of ultra-thin metal "strike" used to improve adhesion to the polymer substrate. The invention according to claim 25, characterized in that: