Capturing images and taking photos has become an almost everyday activity for most people, whether through smartphones, cameras or a growing range of connected devices. Behind this familiar practice sits a complex ecosystem of optical, imaging, and sensing technologies that enable image capture, processing, and interpretation across consumer, industrial, and professional applications. While often taken for granted, these technologies underpin products and systems used in areas ranging from consumer electronics and manufacturing to healthcare, mobility, and automated inspection. The technologies behind these everyday applications are reflected in extensive and diverse patent portfolios held by companies operating across the optics, imaging, and sensing value chain. To provide a structured view of patent portfolios and pruning behavior in this sector, this analysis focuses on 12 leading companies – Canon, Fujifilm, Epson, Sony, Nikon, Olympus, Carl Zeiss, Leica Microsystems, Hoya, Hamamatsu Photonics, LG Innotek and Sunny Optical Technology. Together they maintain more than 206,000 active patent families worldwide. Their portfolios span a broad range of technology clusters, from optics and photography, to electrography and printing, as well as television systems, and image capture and output, as illustrated in the portfolio-size distribution across technology clusters.
Technology clusters of aggregated active patent portfolios of analyzed companies
At an industry level, patent filing activity has trended downward over the past decade. The combined portfolios of the analyzed companies show progressively fewer new patent families filed each year.
Patent filings by owner and filing year
When tracking portfolio size and average quality at successive reporting dates, as shown in the chart below, the active patent portfolios of most companies in the imaging, optics, and sensing sector are contracting over time. This indicates a decline in portfolio size at comparable points in the annual reporting cycle. Notable exceptions are LG Innotek and Carl Zeiss, which display upward trends both in portfolio size and in average patent quality. As the average patent quality across the global patent database is normalized to 1, almost all analyzed companies operate at or above the global average, with Carl Zeiss standing out at approximately twice the global benchmark.
Development of active patent portfolios over the past 4 years in size and strength (as measured by the Patent Asset Index)
To learn about the pruning behavior in the imaging, optics, and sensing industry this pruning analysis examines a test set of approximately 106,000 patent families filed between 2009 and 2017 and still in force at the end of 2020. It is filtered to include patents between three and 12 years from first filing in order to exclude very early-stage and nearly expired cases. By August 2025, around 87,000 of these families remained active. Roughly 17.3% had been discontinued over the period analyzed. Focusing on patents that survived for several years ensures that the dataset captures technologies for which renewal fees had already been paid. And also where companies made deliberate decisions to maintain protection, signaling a degree of confidence and prior investment. The analysis was conducted at the patent family level and does not account for oppositions, invalidations or the specific reasons behind discontinuation. This means that observed pruning reflects well-considered portfolio decisions taken after an initial period of sustained maintenance. While the resulting pruning intensity is moderate compared to more aggressive examples observed in the software sector, the financial implications are substantial. The remaining annuity obligations across the imaging, optics, and sensing portfolios amounting to approximately US $3.4 billion and close to US $240 million falling due in 2026 alone. These figures illustrate that pruning decisions in this industry are not merely administrative. Renewal choices directly affect how resources are allocated within patent portfolios over time. Funds released through patent discontinuation can be reallocated to maintain broader geographic coverage for high-value assets. They can also extend protection lifetimes or support targeted new filings in application areas such as multi-element optical assemblies designed to correct scan distortion and field flatness in laser scanning systems.
To explore how a data-driven approach could benefit your own portfolio, speak with our team about a customized pruning assessment.
While the industry-wide average pruning rate sits at just over 17%, behavior varies substantially across companies. Canon stands out as the most active pruner, reducing its portfolio by more than 30% over the period analyzed. At the other end of the spectrum, LG Innotek shows minimal pruning, discontinuing just over 2% of its active patent families. Between these extremes, companies such as Epson, Fujifilm, and Sony exhibit pruning rates in the mid-20% range. Nikon and Olympus show more moderate reductions. These differences reflect a mix of portfolio age profiles, geographic strategies, and business models rather than a single optimal pruning rate. Nonetheless, the variation highlights the extent to which pruning practices remain uneven across the sector.
To understand whether pruning decisions reflect underlying patent value, patents were grouped into quality deciles using the Competitive Impact metric combining Technology Relevance and Market Coverage. This approach reveals a consistent and intuitive pattern across nearly all analysed companies. Pruning is heaviest in the lowest quality tiers, moderate in the middle, and minimal at the top of the portfolio. For Canon, almost 39% of patents in the lowest three deciles were discontinued, compared to roughly 23% in the top deciles. Epson and Fujifilm show similar selectivity, pruning close to 40% of their weakest patents while retaining the majority of high-impact assets.
Pruning rates across quality deciles
Even among more conservative pruners, such as Carl Zeiss and Hamamatsu Photonics, the same relationship holds. Lower-quality patents are disproportionately affected, while high-quality patents are pruned sparingly. LG Innotek is the main exception, showing low pruning activity across all deciles, which limits observable quality-driven differentiation in its portfolio evolution. These findings mirror those observed in semiconductors and technology platforms. Although there is no evidence that companies explicitly use external quality metrics to guide renewal decisions, the outcomes align closely with what such metrics would suggest. Internal assessments of relevance, enforceability and strategic fit appear to map well onto measurable patent strength.
If you’d like to understand how your own pruning decisions align with measurable quality indicators, our experts can provide a qualitative portfolio assessment.
To assess how pruning affects overall portfolio quality rather than just size, the Portfolio Improvement Index measures changes in the share of high-quality patents relative to low-quality ones. A positive index indicates that pruning has increased the relative weight of stronger assets. In imaging, optics and, sensing, several companies show clear positive movement. Epson demonstrates the strongest improvement, increasing the relative share of high-quality patents by more than 11%. Fujifilm, Canon, and Olympus also show positive index values. This indicates that pruning decisions have led to portfolios more concentrated around higher-impact inventions.
Portfolio Improvement Index
By contrast, LG Innotek records a negative Portfolio Improvement Index. This reflects limited pruning activity and a resulting dilution of average portfolio quality as new patents are added without corresponding discontinuation of weaker assets. This highlights that pruning alone does not guarantee improvement. The timing and selectivity of pruning matter as much as the absolute number of patents discontinued.
Beyond quality effects, the analysis quantifies the potential financial opportunity associated with pruning intensity. If companies with lower pruning rates were to align with the most aggressive peer in the group, lifetime annuity savings could reach tens of millions of dollars per company. For example, LG Innotek, Sony, and Carl Zeiss could each unlock estimated savings between US $30 million and US $40 million over the remaining patent lifetimes if they adopted pruning rates comparable to Canon’s. While such alignment may not be strategically appropriate for every organization, the scale of the opportunity underscores the importance of reviewing renewal practices through both financial and strategic lenses.
Savings against most aggressive pruner
For IP professionals in imaging, optics, and sensing the findings reinforce several strategic lessons. First, pruning outcomes consistently align with patent quality, even when quality metrics are not explicitly used. This suggests that objective indicators can provide valuable early signals to support internal decision-making. Second, pruning often occurs late in a patent’s life. Many discontinued assets had been maintained for more than a decade before being dropped. Earlier, data-informed portfolio reviews could therefore reduce cost exposure sooner and free resources for higher-impact investments. Finally, monitoring pruning behaviour across peers offers insight into shifting industry priorities. Concentrated pruning in specific technology segments may indicate areas of declining relevance, while sustained retention of high-quality patents highlights where long-term value is expected to persist. Given the scale of annuity obligations, patent pruning in imaging, optics, and sensing is likely to become more deliberate and data-driven. The evidence suggests that portfolios emerge strongest where weaker assets are trimmed systematically and high-impact inventions are retained with intent.
What efficiencies are hidden within your patent portfolio? Discover how data-driven patent portfolio pruning can strengthen your IP position and free resources for future innovation.
